Meiosis Day 3,4,5
& Science Fair walkthrough
Bellwork
1. Grab a closure from the front basket.
Add at least 2 sentences to it to make it more
complete or more correct.
2. Complete this phrase on your bellwork sheet:
Meiosis creates _______ cells like _____ and
_____. It begins with __ diploid cell and ends
with ___ _________ cells.
Have out: book, Meiosis notes, and orange worksheet from
yesterday
Announcements & Purpose
Review meiosis
Use book to fill in worksheet
Quiz on Meiosis Thursday
Friday: science fair walk through.
Finger Meiosis
= 2 (chromatid) chromsomes in each cell
Hold up 1 pointer finger= this is chromosome 1 from your
dad.
 Hold up other pointer finger= this is chromosome 1 from
your mom =homologous chromosomes
 Have them replicate (hold up middle fingers too)
 Recombination (mingle them together)

Meiosis 1: Pull hands apart

Meiosis 2: pull fingers apart
= 1 chromatid chromosome in each cell
Write Down…
ALL THE Key Terms!
1.
2.
3.
4.
5.
6.
7.
8.
Prophase I
Metaphase I
Anaphase I
Telophase I
Prophase II
Metaphase II
Anaphase II
Telophase II
nb - You have to actually
define them to get credit at
the end of the unit
9. Meiosis
10. Sexual
Reproduction
11. Asexual
Reproduction
12. Chromatid
13. Chromosome
14. Genetic
Recombination
15. Fertilization
16. Independent
Assortment
17. Ploidy
18. Haploid (n)
19. Diploid (2n)
20. Tetrad
21. Homologous
Pair
22. Crossing Over
23. Somatic Cell
24. Germ Cell
25. Gamete
26. Zygote
SLATE REVIEW
-
Have out worksheets/notes
The merging of an egg and a sperm is
known as:
 A)
a zygote
 B) a gamete
 C) a tetrad
 D) a somatic cell





Haploid (1n) or diploid, (2n)
metaphase I,
metaphase II,
anaphase I,
telophase I
An egg cell is an example of
 A)
a zygote
 B) a gamete
 C) a tetrad
 D) a somatic cell
 During ‘crossing
 A)
over’…
genes are lost or deleted
 B) some genes may move to a
homologous chromosome
 C) homologous pairs may leave the cell
 D) chromosomes will be in Metaphase II





Haploid (1n) or diploid, (2n)
metaphase I,
metaphase II,
anaphase I,
telophase I
In your body, your skin cells are:
 A)
somatic
 B) a 1n gamete
 C) a 2n gamete
 D) a gamete
In asexual reproduction, the offspring are:
 A)
Unique from each other
 B) Identical to the parents
 C)Unique from their parents
 D) Half as many chromatids

When homologous chromosomes line up:
A. Male/female chromosomes will randomly be on
either side
 B. The paternal chromosomes will be on the left
 C. Maternal chromosomes will be on the right
 D. homologous chromosomes don’t line up

Metaphase I
METAPHASE 1
ANAPHASE 1
(choose all that apply)
A sperm cell is:
 A) always diploid
 B) always haploid
 C) always a gamete
 D) half the genetic info. of it’s parent
P. 116-117 Use book to fill
in front side of worksheet
Check:
 Did you label INTERPHASE & does it have
original # of chromatids before replication?
 How many chromatids did you start out with?
 Your final number should be half of that
 If you copied book directly you should start
with 4 original chromatids.
Using book, Define the following vocab on the
back of your white Meiosis notetaker
*Chromatid: is one copy of a duplicated chromosome
Diploid
Haploid
Gamete
*Zygote: the initial cell formed when two gamete cells
are joined by means of sexual reproduction.
Tetrad
*Somatic Cell: ‘normal’ body cell
Homologous pairs:
Announcements & Purpose
Friday: science fair walk through.
Meiosis exam: MONDAY
At top of page in small writing:
Materials:
 -white board to be drawn on (cells, spindle fibers)
 -chalk= represents centriole
 -lengths of 8 beads= chromatid
Chromosome #
Mom’s Color
Dad’s color
1
RED
YELLOW
2
WHITE
GREEN
MEIOSIS w/ beads!



mMaterials:
-white board to be drawn on (cells, spindle
fibers)
-chalk= represents centriole/centrisome
-lengths of 8 beads= chromatid
Chromosome #

Mom’s Color
Dad’s color
1
RED
YELLOW
2
WHITE
GREEN
Create: Meiosis drawing
Label: homologous chromosomes
Chromosome # and from mom/dad,
(in at least 2 phases) & crossing over
Option 1: draw & label each step
Option 2: take cellphone photos, e-mail it to
yourself at school/ print out and label
Bellwork
1. What are ‘homologous pairs of
chromosomes’? Draw an example
2. What is a somatic cell? How does it differ
from a gamete?
3. What is the final product of meiosis?
4. What is your favorite thing you did this
weekend?
Announcements & Purpose
Review meiosis
-Go over Meiosis Bead activity
-Slate review
-Create a quiz
-Group slate review (USING
QUIZ)
Quiz on Meiosis TOMORROW
Check your Meiosis Bead activity
 -Fill
in names of each step
 *Check that your drawing is correct
Holepunch and put in binder at front.
INTERPHASE
PROPHASE
Tetrad= 2 homologous
chromosome sets:
4 chromatids
Crossing over
occurs
METAPHASE 1
ANAPHASE 1
TELOPHASE 1
CYTOKINESIS
PROPHASE1I
METAPHASE II
ANAPHASE II
TELEPHASE II &
CYTOKINESIS

Meiosis I splits the diploid cell into two haploid cells,
which in turn go through meiosis II to produce a total of
4 haploid genetically-different cells. Meiosis II is very
similar to mitosis, except that in meiosis II the nuclei start
out as haploid.
The reason it is haploid after meiosis I is because each
cell has one chromosome set. two sister chromatids still
connected at the kinetochore (a dyad) is equivalent to
one chromosome. they aren't individual chromosomes
until they split during meiosis II.
PROPHASE
2 identical chromatid=
1 chromosome
Tetrad= 2 homologous
chromosome sets:
4 chromatids
=2n
2 identical chromatid=
1 chromosome
Crossing over
occurs
Tetrad= 2 homologous
TELOPHASE
1 sets:
chromosome
4 chromatids
=1n
Tetrad= 2 homologous
chromosome sets:
4 chromatids
=1n
CYTOKINESIS
SLATE REVIEW
-
Have out worksheets/notes
The merging of an egg and a sperm is
known as:
 A)
a zygote
 B) a gamete
 C) a tetrad
 D) a somatic cell





Haploid (1n) or diploid, (2n)
metaphase I,
metaphase II,
anaphase I,
telophase I
An egg cell is an example of
 A)
a zygote
 B) a gamete
 C) a tetrad
 D) a somatic cell
 During ‘crossing
 A)
over’…
genes are lost or deleted
 B) some genes may move to a
homologous chromosome
 C) homologous pairs may leave the cell
 D) chromosomes will be in Metaphase II
Telophase II





Haploid (1n) or diploid, (2n)
metaphase I,
metaphase II,
anaphase I,
telophase I
In your body, your skin cells are:
 A)
somatic
 B) a 1n gamete
 C) a 2n gamete
 D) a gamete
In asexual reproduction, the offspring are:
 A)
Unique from each other
 B) Identical to the parents
 C)Unique from their parents
 D) Half as many chromatids
Anaphase II

When homologous chromosomes line up:
A. Male/female chromosomes will randomly be on
either side
 B. The paternal chromosomes will be on the left
 C. Maternal chromosomes will be on the right
 D. homologous chromosomes don’t line up

Metaphase II
METAPHASE 1
ANAPHASE 1
Metaphase I
What is a tetrad?
• Homologous chromosomes that pair up in a
set during prophase 1
End of: Meiosis 1 or Meiosis II?
(choose all that apply)
A sperm cell is:
 A) always diploid
 B) always haploid
 C) always a gamete
 D) half the genetic info. of it’s parent
Anaphase I
_____________
Independent
_____________
Assortment
occurs creating
new
_____combinations!
 At
 A)
the end of Telophase I, there are:
4 haploid daughter cells
 B) 2 haploid daughter cells
 C) 4 diploid daughter cells
 D) 2 diploid daughter cells
 At
 A)
the end of Telophase II, there are:
4 haploid daughter cells
 B) 2 haploid daughter cells
 C) 4 diploid daughter cells
 D) 2 diploid daughter cells
Meiosis quiz
• 1. Create a 10 question quiz (with answers on the back)
• Include at least 2 drawing questions (a drawing of a phase
and ask them to label it)
• Include the following vocab:
-Somatic
-Sexual reproduction
-Asexual reproduction
-Crossing over
-Gamete
-Homologous chromosomes
-Diploid
-Haploid
Bellwork
After stamp switch quiz with a partner or
group mate and answer the questions, then fill
in the following on your bellwork:
1. Choose the most difficult question and
write why it was difficult.
2. Choose the most simple question and
write why it was simple.
3. Why is creating a quiz a valid way to
study for an exam?
Announcements & Purpose
Review meiosis
Use book to fill in worksheet
Quiz on Meiosis Thursday
Friday: science fair walk through.
Whoa-no-mei-oh-sis.
• http://www.youtube.com/watch?v=iCL6d0Ow
Kt8&feature=player_embedded
Genetics- what do you know?
Closure