Catalyst:
1.Mouths are quiet.
2.Homework in your folder.
3.Raise your hand if you need something.
You’ve got gametes in
your fridge!
An egg is a female chicken’s
gamete that was never fertilized
by a male chicken’s sperm cell.
Quick Review
1. A female chicken egg cell has
39 chromosomes. How many
chromosomes are in a sperm cell?
2. If they joined BEFORE the egg
was laid, what would happen?
Quick Review
1. A female chicken egg cell has
39 chromosomes. How many
chromosomes are in a sperm cell?
39 chromosomes
2. If they joined BEFORE the egg
was laid, what would happen?
Quick Review
1. A female chicken egg cell has
39 chromosomes. How many
chromosomes are in a sperm cell?
39 chromosomes
2. If they joined BEFORE the egg
was laid, what would happen?
A zygote would be formed that
would eventually develop into a
chick that would hatch from the
egg.
Quick Review
3. How many chromosomes
would be in the beak cell of
the offspring if a zygote was
formed?
Quick Review
3. How many chromosomes
would be in the beak cell of
the offspring if a zygote was
formed?
The beak (somatic) cells of
the offspring would have 78
chromosomes in each cell!
(39 from egg + 39 from sperm
= 78)
Unit 1.10 – Meiosis vs. Mitosis
BY THE END OF THE DAY YOU WILL:
1.Be able to describe the difference
between mitosis and meiosis.
2.Be able to define haploid and diploid
cells.
Key Point 1
1.Mitosis is the production of
somatic cells
a.It produces cells with the full
number of chromosomes
b.These cells are used in asexual
reproduction, repair, and growth
Key Point 1
2.Meiosis is the production of
gametes
a.It produces cells with half the
number of chromosomes
b.These cells are used in sexual
reproduction only
Key Point 1
3. Cells that have half the number
of chromosomes = haploid
(gamete)
4.Cells that have the full number of
chromosomes = diploid (somatic)
Guided Practice
On the front of your
notes 
Work WITH us, not ahead.
I-N-D-E-P-E-N-D-E-N-T
DO YOU KNOW
WHAT THAT MEANS?
“I do my own work!”
USE THIS INFORMATION TO ANSWER
SETS 1 & 2 IN THE BOXES BELOW: A
spotted lemur is an organism that
reproduces sexually. Male spotted
lemurs have sperm cells that contain
25 chromosomes each.
Set 1:
1. Classify the lemur cell described in the
scenario as either a somatic or gamete.
Justify your answer.
2. How many chromosomes would be in the
egg cell of a female lemur?
3. Which process would be responsible for
producing the egg and sperm cells of the
lemur?
Set 2:
1. Classify the lemur cell described in the
scenario as either haploid or diploid. Justify
your answer.
2. Consider a cell from the eye of the lemur.
How many chromosomes would that cell
contain?
3. If a male and a female lemur reproduce
to form offspring, how many chromosomes
would be in the skin cells of the offspring?
USE THIS INFORMATION TO ANSWER
SETS 3 & 4 IN THE BOXES BELOW: A
female kangaroo carries her baby
around in her pouch. This baby has
skin cells with 12 chromosomes.
Set 3:
1. Classify the kangaroo cell described in the
scenario as either a somatic or gamete.
Justify your answer.
2. How many chromosomes would be in a
skin cells taken from the pouch of the mother
kangaroo?
3. If the mother accidentally hopped into a
thorn bush, which process would her body
use to repair the damaged cells?
Set 4:
1. Classify the kangaroo cell described in the
scenario as either haploid or diploid. Justify your
answer.
2. Once the baby kangaroo becomes sexually
mature, how many chromosomes will be its
gametes? Are these cells considered haploid or
diploid?
3. In order to be considered sexually mature the
baby kangaroo must produce gametes. Which
process produces gametes?
USE THIS INFORMATION TO ANSWER
SETS 5 & 6 IN THE BOXES BELOW: A
female red-eyed tree frog lays eggs
with 13 chromosomes. After she lays
them, a male red-eyed tree frog
fertilizes the eggs with his sperm. Each
sperm cell contains 13 chromosomes.
Set 5:
1. Classify the tree frog cells described in
the scenario as either a somatic or
gamete. Justify your answer.
2. In order to become fully grown tree
frogs, the frog eggs shown on the screen
must go through a great deal of growth
and development. Which process will allow
these tree frogs to grow and develop?
Set 6:
1. Classify the tree frog cells described
in the scenario as either haploid or
diploid. Justify your answer.
2. How many chromosomes will be in
the somatic cells of the offspring?
Explain your answer choice (tell me
why you are correct)
EXIT TICKET TIME
Notes away,
mouths closed.
1. Which of the following statements is
true about mitosis?
A. It produces gamete cells
B. It produces cells with the full number
of chromosomes
C. It produces cells without DNA
D. It produces cells to be used in sexual
reproduction
2. Which statement correctly identifies a difference
between mitosis and meiosis?
A.
Mitosis makes new cells and meiosis destroys
old cells
B.
Mitosis is only used during reproduction and
meiosis is only used during growth
C.
Mitosis is used in asexual reproduction, meiosis is
used in sexual reproduction
D.
Mitosis produces gamete cells, meiosis
produces somatic cells
3. A scientist is researching the haploid cells of a
rose. Which of the following statements is true
about these particular cells?
A.
These cells are somatic.
B.
These cells have the full number of
chromosomes for an organism.
C.
These cells are sex cells.
D.
These cells where produced through a process
called mitosis.
4. Which of the following is true about somatic
cells?
A.
They contain half the number of chromosomes
as gametes
B.
They come together to form a new organisms
in sexual reproduction
C.
They are considered to be diploid cells based
on their number of chromosomes
D.
They will never be able to divide, grow, or
reproduce.
5. The
somatic cell of an organism contains 30
chromosomes. This cell is __________ and
the organism’s gametes would have
_________ chromosomes.
A. Haploid; 60
B. Haploid; 15
C. Diploid; 60
D. Diploid; 15