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Meiosis Unit Cover Page
(see guidelines on page 21)
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Meiosis Unit Front Page
At the end of this unit, I will:
 Know the difference between sexual and asexual
reproduction.
 Understand the difference between haploid and
diploid cells.
 Understand the steps involved in meiosis with
regard to gametes and chromosome number.
 Interpret a karyotype, being able to identify gender
or potential disorder from the karyotype.
Roots, Prefixes and Suffixes I will be able to understand when I see them in words are:
 Homo-, chromo-, hap-, di-, karyo -logous, -some
The terms I can completely define are:
 Gene, homologous chromosome, gamete, haploid, fertilization, diploid, meiosis, crossing
over, karyotype, telomere, nondisjunction
The assignments I will have completed by the end of this unit are:
 Meiosis Unit Cover Page (page 269)
 Reproduction Notes (page 271, 273)
 Understanding Haploid & Diploid (page 272)
 Pictomicrograph of Chromosomes (page 274)
 Chromosomes and Karyotypes (page 275 )
 Using Karyotypes to Predict Genetic Disorders (pages 276-277)
 Patient Histories: Karyotyping Activity (pages 277-279)
 Meiosis Layered Foldable (page 281)
 Meiosis Overview (page 282)
 Meiosis Notes (pages 283-289)
 Meiosis Songs (pages 290-291)
 Meiosis Pipe Cleaner Play (pages 292-295)
 Meiosis Unit Review (pages 300-304)
 Meiosis Unit Student Concept Cards (page 305)
 Meiosis Unit Student Concept Map (page 306)
 Parent/Significant Adult Review Page (pages 307-308)
 Meiosis Unit Back Page (309)
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Reproduction Notes
A form of reproduction that:
What is asexual
reproduction?

is _____ - _______________ (only ____________ parent is needed)

produces ___________ ____________clones of the parent
( __________ _________ of the original)
Characteristics:
 ________________________
What are some
characteristics of asexual
reproduction?

________________________

Allows _________ spread of an organism
(ex. ________________ growth)

Since the offspring are identical, there is no mechanism for
introducing
What are some specific
examples of asexual
reproduction?
Why do organisms have
sex?
____________ .

Prokaryotes undergo _______________ ___________________

Hydra reproduce by _____________________

Planaria reproduce by ________________________________

Several plants reproduce through _____________________
reproduction.

Most of these organisms can reproduce _______________ as well.

Sexual reproduction increases ____________________ by
producing new _____________________ combinations.

Genetic diversity allow ____________________ to _________________ to
ever- changing environments
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Meiosis and Reproduction Warm-up
Humans have 46 chromosomes in all of their body cells. The first cell of the organism is made by
joining egg and sperm.
1. How many chromosomes do you think are in a human egg or sperm cell? Explain.
_________________________________________________________________________________________________________
_________________________________________________________________________________________________________
2. Do you think that cell division by mitosis (duplication of cells) can produce egg or sperm?
Explain.
_________________________________________________________________________________________________________
_________________________________________________________________________________________________________
Understanding Haploid and Diploid
If N=2, 2N would look like:
= A chromosome
= A chromosome
There are 2 different types of chromosomes in
this cell. 2N means that this cell is diploid (or
there are two copies of each chromosome). How
many total chromosomes are present in this
cell? _________
1. Draw the chromosomes in a diploid cell of an organism where N=3.
2. How many combinations of haploid (eggs or sperm) cells are possible if N=2? Draw the
possible combinations.
3. How many combinations of haploid cells are possible if N=3?
Draw the possible combinations.
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Reproduction Notes

________________ for fertilization usually come from separate
parents
Sexual Reproduction
What is the difference
between oogenesis and
spermatogenesis?
What does it mean to have a
haploid vs. a diploid set of
chromosomes?

–
Female produces an ________ (____genesis)
–
Male produces ____________ (__________ genesis)
Both gametes are ____________, with a ________ set of
____________________________.

The new individual is called a __________________, with ______ sets
of chromosomes (___________________).
What is dividing zygote
called?

Once the zygote begins to divide, it is called an _________________.
Consists of ____________________ and ____________________________

Meiosis: Formation of _______ ___________ reproductive cells
(gametes) from a single ____________ cell of the parent.
What does sexual
reproduction consist of?

–
In humans, meiosis only occurs in the _____________
–
Spermatogenesis: In the ______________(in males)
–
Oogenesis: In the _______________ (in females)
______________________: _______________________ of ___________
gametes from two different parents to produce a ____________
individual

Chromosomes vary from
species to species.



Prokaryotes generally have only one major chromosome,
consisting of a single circle of DNA
Turkeys have 82
Giant redwoods have 22
A tropical fish has the same number of chromosomes as
humans, which is 46
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Photomicrograph of Chromosomes
What is the name for the way these chromosomes are organized? _______________________________________
Circle the sex chromosomes in the following image. What is the gender of this person? ______________
Is the following karyotype normal or abnormal? Why?
What is the gender of this person? ___________________________________
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Chromosomes and Karyotypes
Human Chromosome Characteristics:
How do you calculate the
haploid number from the
diploid number of an
individual?
___________ set for humans: 2n = ______ chromosomes
n = 23 chromosomes (haploid set)
Two types of chromosomes:
What are the two types of
chromosomes?
•
___________________ (chromosomes 1 – 22)
•
_______ Chromosomes (chromosome ____)
Autosomes:
•
________________ chromosomes
(w/ ________________ pairs)
What is the difference in
characteristics between an
autosome and sex
chromosomes?
•
Humans have _____ pairs
Sex chromosomes:
•
Humans have ____ pair
•
___________-sex chromosomes are ____________________ (__ __)
•
________-sex chromosomes are ____- _____________________ (__ __)
Scientists can organize chromosomes in a cell into a ________________
What can karyotypes tell us?
In a karyotype, chromosomes are arranged in order of__________,
_____________ _______________, and ___________________ position.
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USING KARYOTYPES TO PREDICT GENETIC DISORDERS
Use the following website to help you fill in the blanks and answer the following questions.
http://learn.genetics.utah.edu/content/begin/traits/predictdisorder/
1. A normal human karyotype has ______ chromosomes: _____ pairs of autosomes and ____ sex
chromosomes. Cells don’t always end up with these chromosomal numbers, though. The
following text outlines what happens when cells end up with too much or too little genetic
information.
2. Too many or too few chromosomes:
a.
To understand how our cells might end up with too many or too few chromosomes, we
need to know how the cells normally get _____ chromosomes.
b. First we need to understand meiosis. Meiosis is the cell division process that produces
egg and sperm cells (___________), which normally have ______ chromosomes each.
c.
If eggs and sperm only have one set of _____________________, then how do we end up with
46 chromosomes? During ______________________, when the egg and sperm fuse, the
resulting _________________ has two copies of each chromosome needed for proper
development, for a total of ________.
3. How can cells end up with too many or too few chromosomes?
a.
Sometimes chromosomes are incorrectly distributed into the egg or sperm cells during
_______________. When this happens, one cell may get __________ copies of a particular
chromosome, while another cell gets none.
b. What happens if a sperm or egg cell with an abnormal number of chromosomes
participates in fertilization? It depends on how many chromosomes the gamete has. For
example, if a ___________ with an extra chromosome fertilizes an egg with a normal
chromosome number, the resulting zygote will have _____ copies of one chromosome.
This is called _______________.
c.
If a sperm that is missing a ___________________ fertilizes an egg, then the resulting zygote
will have only one copy of that chromosome. This is called ________________________
d. People who are born with an abnormal number of chromosomes often have genetic
disorders because their cells contain too much or too little genetic information.
Scientists can predict genetic disorders by looking for extra or missing chromosomes in
a ___________________.
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USING KARYOTYPES TO PREDICT GENETIC DISORDERS
4. Missing pieces of chromosomes
a.
In some cases, genetic material is missing from a chromosome. Such chromosomes are
said to have __________________.
b. Deletions large enough to be seen in a karyotype result in the loss of many _____________.
In humans, these are less common than deletions that remove small portions of a
chromosome.
c.
A _________________________ is a chromosome rearrangement in which part of a chromosome
breaks off and then reattaches to a different chromosome.
QUIZ: Use the options listed below and your knowledge to answer the following questions. Some options will be
used more than once.
Normal female
Turner Syndrome
Normal male
Klinefelter Syndrome
Down Syndrome
1. _______________________
5. _______________________
2. _______________________
6. _______________________
3. _______________________
7. _______________________
4. _______________________
8. _______________________
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Patient Histories: Karyotyping Activity
Introduction
This exercise is a simulation of human karyotyping using digital images of chromosomes from
actual human genetic studies. You will be arranging chromosomes into a completed karyotype, and
interpreting your findings just as if you were working in a genetic analysis program at a hospital or
clinic. Karyotype analyses are performed over 400,000 times per year in the U.S. and Canada.
Imagine that you were performing these analyses for real people, and that your conclusions would
drastically affect their lives.
G Banding
During mitosis, the 23 pairs of human chromosomes condense and are visible with a light
microscope. A karyotype analysis usually involves blocking cells in mitosis and staining the
condensed chromosomes with Giemsa dye. The dye stains regions of chromosomes that are rich in
the base pairs Adenine (A) and Thymine (T) producing a dark band. A common misconception is
that bands represent single genes, but in fact the thinnest bands contain over a million base pairs
and potentially hundreds of genes. For example, the size of one small band is about equal to the
entire genetic information for one bacterium.
The analysis involves comparing chromosomes for their length, the placement of centromeres
(areas where the two chromatids are joined), and the location and sizes of G-bands.
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Patient Histories: Karyotyping Activity
Your assignment:
This exercise is designed as an introduction to genetic studies on humans. Karyotyping is one of
many techniques that allow us to look for several thousand possible genetic diseases in humans.
You will evaluate 3 patients' case histories, complete their karyotypes, and diagnose any missing or
extra chromosomes. The assignment will be completed online, while the questions must be
answered on the following page.
Use the following website to help these patients diagnose their disorders from karyotypes and
answer the following questions.
http://www.biology.arizona.edu/human_bio/activities/karyotyping/karyotyping2.html
Patient Histories:
Patient A
Patient A is the nearly-full-term fetus of a forty year old female. Chromosomes were obtained from
fetal epithelial cells acquired through amniocentesis. Complete Patient A's Karyotype (this will have
to be done online).
Patient B
Patient B is a 28 year old male who is trying to identify a cause for his infertility. Chromosomes
were obtained from nucleated cells in the patient's blood. Complete Patient B's Karyotype.
Patient C
Patient C died shortly after birth, with a multitude of anomalies, including polydactyly (more than
five fingers on a hand) and a cleft lip. Chromosomes were obtained from a tissue sample. Complete
Patient C's Karyotype.
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Patient Histories: Karyotyping Activity
Making a diagnosis:
The next step is to either diagnose or rule out a chromosomal abnormality. In a patient with a
normal number of chromosomes, each pair will have only two chromosomes. Having an extra or
missing chromosome usually renders a fetus inviable (meaning that it will not live). In cases where
the fetus makes it to term, there are unique clinical features depending on which chromosome is
affected. Listed below are some syndromes caused by an abnormal number of chromosomes.
Diagnosis
Chromosomal Abnormality
Normal # of chromosomes
Patient's problems are due to something other than an abnormal
number of chromosomes.
Klinefelter's Syndrome
One or more extra sex chromosomes (i.e., XXY)
Down's Syndrome
Trisomy 21, extra chromosome 21
Trisomy 13 Syndrome
Extra chromosome 13
1. What observations can you make regarding patient A’s karyotype?
_________________________________________________________________________________________________________
_________________________________________________________________________________________________________
2. What diagnosis would you give patient A? Explain your answer.
_________________________________________________________________________________________________________
_________________________________________________________________________________________________________
3. What observations can you make regarding patient B’s karyotype?
_________________________________________________________________________________________________________
_________________________________________________________________________________________________________
4. What diagnosis would you give patient B? Explain your answer.
_________________________________________________________________________________________________________
_________________________________________________________________________________________________________
5. What observations can you make regarding patient C’s karyotype?
_________________________________________________________________________________________________________
_________________________________________________________________________________________________________
6. What diagnosis would you give patient C? Explain your answer.
_________________________________________________________________________________________________________
_________________________________________________________________________________________________________
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Meiosis Layered Foldable
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Meiosis Overview
Follow your teacher’s powerpoint presentation, and draw the overview of meiosis, using two
different colors.
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Meiosis Notes
Meiosis begins after interphase, when the __ __ __replicates.
Meiosis is often called ____________________/____________________
Reduction:

Process takes a ________________ cell with two sets of
chromosomes and reduces it to a _________________ cell
with one set of chromosomes.
When does meiosis start?
What is meiosis often called and why?
Division

The cytoplasmic division of one cell into _______ cells.

This takes 2 rounds of division.
Meiosis can be broken up into two phases of division:
and
.
Meiosis I

Prophase I
Prophase I is much like the prophase of mitosis:
1. Nuclear membrane _________________________
2. ________________ form
3. Chromatin ________________ into __________________.
However, unlike mitosis, where the chromosomes of a
homologous pair are randomly scattered within the nucleus, in
prophase I of meiosis:
1. Homologous chromosomes group with other homologous
chromosomes to form a “_________________”
2. A “_________________” occurs at the point where the
chromosomes ___________ ___________, _______________, and
______________ ________________ of the chromosome
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Check for Understanding: Phases of Meiosis
Name of Phase
Description
1.
Homologous chromosomes pair up and form tetrad
2.
Spindle fibers move homologous chromosomes to opposite sides
3.
Nuclear membrane reforms, cytoplasm divides, 4 daughter cells formed
4.
Chromosomes line up along equator, not in homologous pairs
5.
Crossing-over occurs
6.
Sister chromatids separate
7.
Homologous chromosomes line up alone equator
8.
Cytoplasm divides, 2 daughter cells are formed
On each of the images, label the phase of meiosis.
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Meiosis Notes

Metaphase I
Metaphase I
1. _____________________ chromosomes _________ ____ at the
_______________ _______________ .
2. Microtubules (_______________) attach to the kinetochore of
_____________________

Anaphase I
Anaphase I
1. Homologous chromosomes ____________________.
2. _____________________________________________________________________
_______________________________________________

Telophase I
Telophase I/Cytokinesis
1. _____ daughter _________ are formed with each one containing
only _____ chromosome of the _________________ __________.
2. The daughter cells are now ___________________.
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Meiosis Application:
Label the micrographs of lily anthers undergoing meiosis.
1. A cell with a diploid number (2N) of 20 undergoes meiosis. This will produce ________
daughter cells, each with a haploid number of ____________ chromosomes.
2. Crossing over occurs during this phase: _______________________
3. True or False: The only difference in mitosis and meiosis is that meiosis happens in
order to create sex cells.
4. At the end of meiosis I, ________ daughter cells are created. These daughter cells are
[diploid | haploid]. (Pick one)
5. Meiosis occurs in what type of cells: ____________________________
6. Circle the homologous chromosomes.
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Meiosis Notes
Meiosis II

Prophase II
Prophase II
1. DNA does __________ ________________________.
2. Prophase II is just like ______________ prophase.

Metaphase II
Metaphase II
1. All of the chromosomes line up at the ____________________
plate.

Anaphase II
Anaphase II
1. __________________ divide
2. _______________ ____________________ migrate separately to each
pole.
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Mitosis vs. Meiosis
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Meiosis Notes

Telophase II/Cytokinesis
Telophase II/Cytokinesis
1. Chromosomes revert to _________________.
2. ____________ ____________.
3. Cytoplasm _______________.
4. Four ______________ daughter cells are obtained
Mitosis vs. Meiosis
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Meiosis Song to the Tune of “Are You Sleeping”
Use your fingers to “act out” meiosis to this song. Your teacher will direct you.
I’m from my mommy
I’m from my daddy
Replicate
Replicate
At prophase we cross over
Then shuffle, shuffle, shuffle
Separate
Separate
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Meiosis Square Dance Lyrics
Now coil up, coil up, coil up tight
With a fiber stuck to your centromere
If we’re to do meiosis right
You’re pulled into the center here
Interphase one is almost done
On the central plate for metaphase two
Marks the start of prophase one
Just like before it’s déjà vu
Face your partners and do them bow
At Interphase one you duplicate
Do-se-do crossover now
So now that you can separate
Allemande left with your left hand
The fibers tugging this is it
Promenade around the land
Time for your chromatids to split
Now grab your partner’s chromatid
Anaphase, anaphase, anaphase two
Crossing arms you’ll be glad you did
This time you wave goodbye to you
The nuclear membrane breaks down here
At telophase two half the teams on hand
Attach your fiber to you centromere
You’re feeling sad you’re a single strand
The fibers pull the dance is done
Now this is just your normal state
Hold on tight its metaphase one
With some luck you’ll procreate
Couples move to the central plate
So rest a while and unwind too
It’s anaphase one so you separate
As the nuclear membrane surrounds you
Now wave goodbye to reach your goal
Now meiosis is complete
Each partner move to the other pole
Four nuclei from ones the treat
Telophase one is mighty sad
The cytoplasm will divide
You’re all alone lost what you had
Four gametes form with you inside
Together we’ll no longer be
And if we zoom out you will find
These parts of you will be dear to me
Many more of the same kind
Prophase, prophase, prophase two
And if you’re wondering what’s the use
The spindles coming after you
It’s all so we can reproduce… reproduce
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Meiosis Pipe Cleaner Play
Act 1: Scene I – Interphase
Act 1: Scene 2 – Prophase I
Act 1: Scene 4 –After
Cytokinesis of Meiosis I
Act 2: Scenes 3 and 4 – After
Cytokinesis of Meiosis II
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Meiosis Pipe Cleaner Play
Introduction: A fruit fly’s testes are going through meiosis. What combination of alleles will be
passed on in each of his gametes?
Act 1: Scene 1 - Interphase
The fruit fly has 6 chromosomes. The genotype of your fruit fly is GgBbrr. Remove these
chromosomes from your bag to start the play.
-Chromosome 1: with allele G (for Gray eyes)
-Chromosome 2: with allele g (for green eyes)
-Chromosome 3: with allele B (for black, solid body)
-Chromosome 4: with allele b (for striped body)
-Chromosome 5: with allele r (for shriveled wings)
-Chromosome 6: with allele r (for shriveled wings)
Draw the arrangement of your chromosomes during the S-phase of interphase. Show duplicated
DNA connected at the centromere. Make sure to mark the alleles.
Act 1: Scene 2 - Prophase I
Homologous chromosomes pair up (not line up)
Cross-over occurs on at least 2 homologous pair with at least 2 alleles. (Switch beads)
Draw the new genetic combinations of your chromosomes at this phase after cross-over.
Act 1: Scene 3- Metaphase I
Random line-up of homologous pairs.
Act 1: Scene 4 – Anaphase I ,Telophase I, and Cytokinesis
Homologous pairs separate
Nuclei reform in two separate cells.
Draw the chromosomes and alleles that exist in each of the two cells.
Act 2: Scene 1 and 2 – Prophase II and Metaphase II
Nuclei disappear
Chromosomes line up at equator.
Act 2: Scene 3 and 4 – Anapahse II ,Telophase II, and Cytokinesis
Sister chromatids split to opposite poles
Nuclei reform in 4 separate cells (4 haploid gametes are created)
Draw the allele combination present in each of the haploid gametes.
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Meiosis Pipe Cleaner Play
Act 3: Fertilization
Choose one of the four gametes created and write down its Genotype here ____________.
Have it fertilize another gamete with the genotype Gbr.
What is the new offsprings full genotype? _________________
Draw the new fly offspring in the space below. Use color and make sure it matches the genotype.
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Meiosis Pipe Cleaner Play
Act 3: Fertilization
Your fly meets a female fly, and they like each other and want to have baby flies.
Choose one of your four gametes to be the “sperm”
Draw what kind of fly would be created if your fly’s sperm fertilized an egg in the other fly
with the allele combination Gbr.
Encore!
Return all pipe-cleaners into the original bag!
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Meiosis Unit Review
1. What term is used to describe “body” cells containing the normal number of chromosomes?
_______________________
2. What term is used to describe cells containing half the number of chromosomes? _________________
3. Mitosis produces (circle one)
diploid / haploid
cells.
4. Meiosis produces (circle one)
diploid / haploid
cells.
5. Define the difference between diploid and haploid.
6. How many pairs of chromosomes do human body cells have? _______ pairs.
7. Which pair of chromosomes designates the organism’s gender? Chromosome # _____
8. What is the difference between oogenesis and spermatogenesis?
Chromosome Numbers of Some Common Organisms
Organism
Body cell (2n)
Gamete (n)
Human
46
_______
Garden Pea
_______
7
Fruit Fly
8
_______
Tomato
_______
12
Dog
78
_______
Chimpanzee
_______
24
Leopard Frog
26
_______
Corn
_______
10
Apple
_______
17
Indian Fern
1260
_______
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Meiosis Unit Review
Meiosis I (Prophase I, Metaphase I, Anaphase I, Telophase I)
During prophase I, the _______________________ coil up and the _____________ fibers form. Then each pair
of homologous chromosomes come together to form a four-part structure called a ____________ (tetra
= what number?____). A tetrad consists of two homologous chromosomes, each made up of two
sister chromatids.
These 4 chromatids in a ____________ are held very close and tightly together. In fact, they are so close
that the arms of non-sister chromatids can wind and twist around each other, and exchange genetic
information (genes, DNA). This is called _______________ ____________. Crossing over results in new
combinations of alleles.
The Phases of MEIOSIS
Before meiosis begins: Interphase
Before meiosis begins, what must happen to the cell’s DNA/chromosomes?
____________________________________
Meiosis occurs in sexual reproduction when 1 diploid germ cell produces 4 haploid cells that can
mature to become ____________________ (sperm or ova).
Prophase I
Like prophase of mitosis:
1. The ______________ ______________ disappears.
2. ___________________ move to the opposite poles and the
_______________ ___________ form between the centrioles.
3. __________________ condenses into sister _________________.
Unlike prophase of mitosis:
1. Pairs of homologous chromosomes form _________.
2. _________________ _________ may occur.
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Meiosis Unit Review
Metaphase I
1. Spindle fibers attach to _________________.
2. Tetrads line up at the ___________________ plate.
Anaphase I
1. Tetrads, which consist of two ___________________ ________________,
separate.
Telophase I / Cytokinesis I
1. _______________ __________________ reappears.
2. _______________ ______________ disappears.
3. ___________________, the division of the cytoplasm and the
organelles begins and ends forming two cells.
Meiosis II (Prophase II, Metaphase II, Anaphase II, Telophase II)
The purpose of meiosis II is to separate _______________ ___________________ of each chromosome into
separate cells.
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Meiosis Unit Review
Prophase II
1. _______________ _______________ disappears.
2. _______________ _____________ form.
3. __________________ condenses into sister _________________.
Metaphase II
1. Sister chromatids attach to the ________________
________________.
2. Sister chromatids line up at the ________________.
Anaphase II
1. Sister chromatids separate into
_____________________.
2. Chromosomes move to the opposite ___________.
Telophase II
1. ______________ _________________ reforms.
2. 4 ______________ are formed.
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Meiosis Unit Review
Comparing Mitosis and Meiosis:
Determine whether the following characteristics apply to mitosis, meiosis, or both by
putting a check in the appropriate column(s)
Characteristic
No pairing of homologous
chromosomes
Two Divisions
Four daughter cells Produced
Associated with growth and
asexual reproduction
Associated with sexual
reproduction
One Division
Two daughter cells are
produced
Involves duplication of
chromosomes during interphase
prior to division
Chromosome number is
maintained
Chromosome number is halved
Crossing over occurs
Tetrads form
Daughter cells are identical to
parent cell
Daughter cells only have half the
genetic information as the
parents
Produces gametes
Chiasmata or synapsis occurs in
prophase
Independent assortment of
tetrads along metaphase plate
Sister Chromatids separate
Homologous Chromosomes
separate
Genetic diversity is introduced
Cloning
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Mitosis
Meiosis
Meiosis Unit Student Concept Cards
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Meiosis Unit Student Concept Map
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Parent/Significant Adult Review Page
Student Portion
Unit Summary (write a summary of the past unit using 5-7 sentences):
Explain your favorite assignment in this unit:
Adult Portion
Dear Parent/ Significant Adult:
This Interactive Notebook represents your student’s learning to date and should contain the work
your student has completed. Please take some time to look at the unit your student just
completed, read his/ her reflection and respond to the following
Please write down 3 facts that your student has shared with you that they learned during this unit:
What assignment was the most effective at helping your student learn the content of this unit:
Parent/ Significant Adult Signature:
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Intentionally Left Blank
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Meiosis Foldable Directions:
You will be using two templates to create two 6-tab foldables. For each template, cut along the solid
lines and fold along the dashed lines. Assemble the three pieces into a foldable similar to the one on
page 18 of your interactive notebook.
The 12 tabs should be labeled or filled as follows:
Meiosis
Drawing of a cell
in telophase I.
Drawing of a cell in
interphase
Drawing of a cell
in late prophase II.
Drawing of a cell in
early prophase I.
Drawing of cell in
metaphase II.
Drawing of a cell in
late prophase I.
Drawing of cell in
anaphase II.
Drawing of cell in
metaphase I.
Drawing of a cell
in telophase II.
Drawing of a cell in
anaphase I.
Drawing of the
final products of
meiosis
Requirements:
 Shows Process – drawings must start with a cell that starts with diploid number (2N = 6)
to create four haploid gametes (N = 3) as the end product. Correct number of chromosomes
must be shown throughout the process.
 Chromosomal Size or Centromere Considerations – differentiate the chromosomes using
varying sizes or varying centromere positions. The homologous pairs should be of the same
size with the same centromere position.
 Colorful – must include four or more colors throughout the foldable. Differentiate your
homologous pairs with at least two different colors.
 Neat – consider sketching in pencil, then trace in ink and color.
 Informative – underneath each of the 12 tabs, include all important identifying
characteristics of that stage of meiosis.
 Storage – Create a “pocket” on page 281 to store your layered foldable. Optional: you can
place your foldable in a clear page protector in front of page 281.
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Meiosis Unit Back Page
The California State Standards I have come to use
and understand are:
(Please check all that you do feel you used and
understood this unit)

Meiosis is an early step in sexual
reproduction in which the pairs of
chromosomes separate and segregate randomly during cell division to produce gametes
containing one chromosome of each type.

Only certain cells in a multicellular organism undergo meiosis.

New combinations of alleles may be generated in a zygote through the fusion of male
and female gametes.

Why approximately half of an individual’s DNA sequence comes from each parent.

The role of chromosomes in determining an individual’s sex.

The genetic basis for Mendel’s laws of segregation and independent assortment.
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