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Name: _______________________________ Period: _______ Date: ___________________
KIPP NY C College Prep
Genetics and Biotech
UNIT 7: Meiosis and Differentiation
Lecture 4: Human Gametes and Review
By the end of today, you will have an answer to:
How do sperm and egg cells form in humans?
Do Now:
The following picture depicts independent assortment of chromosomes.
1) How does this process increase genetic diversity?
This second picture depicts crossing over of homologous chromosomes
2) Describe what is happening in this picture to depict crossing over.
3) How does crossing over help increase genetic diversity?
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100% EVERYDAY.
Look at the pictures above:
--Identify what is produced during spermatogenesis and oogenesis.
--Describe two similarities between the two processes.
1)
2)
--Describe four differences between the two processes.
1)
2)
3)
4)
Why are the different processes needed for each?
--spermatogenesis:
--oogenesis:
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Use your notes to label the different stages:
Meiosis I:
Meiosis II:
Use your notes: Side by side: Mitosis vs. Meiosis
Compare:
1) Number of cells produced
2) Number of chromosomes in final compared to initial cells.
3) Number of rounds of cell division.
1) Which process creates identical cells?__________________________
2) Which process increases genetic diversity? _______________________
3) Which process is related to cancer? ________________________
4) Which process creates sperm and egg cells? ____________________
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Practice Multiple Choice:
1) A micrograph of a dividing cell from a mouse showed 19 chromosomes, each consisting of two sister
chromatids. During which of the following stages of cell division could this picture have been taken?
1. Prophase of mitosis
2. Telophase II of meiosis
3. Prophase I of meiosis
4. Anaphase of mitosis
5. Prophase II of meiosis
--Explain:
2) If an intestinal cell in a grasshopper contains 24 chromosomes, a grasshopper sperm cell would contain
_____ chromosomes:
1. 3
2. 6
3. 12
4. 24
5. 48
--Explain:
3) If an intestinal cell in a grasshopper contains 24 chromosomes, it would have this number of sister
chromatids in G2 of interphase:
1. 3
2. 6
3. 12
4. 24
5. 48
--Explain:
Summarizing
Describe 1 similarity and 1 difference between spermatogenesis and oogenesis.
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
Work hard. Be nice.
100% EVERYDAY.
Name: _______________________________ Period: _______ Date: ___________________
KIPP NY C College Prep
Genetics and Biotech
HW 7.4—Human Gametes and Review
10 points
Review Analysis:
1. How does the arrangement of chromosomes at metaphase I affect the combination of chromosomes in the
four nuclei at telophase II?
2. Meiosis is important in increasing our genetic diversity. Give two reasons that it is able to increase the
genetic diversity of any sexually reproducing species.
Name: _______________________________ Period: _______ Date: ___________________
KIPP NY C College Prep
Genetics and Biotech
HW 7.4—Human Gametes and Review
10 points
Review Analysis:
1. How does the arrangement of chromosomes at metaphase I affect the combination of chromosomes in the
four nuclei at telophase II?
2. Meiosis is important in increasing our genetic diversity. Give two reasons that it is able to increase the
genetic diversity of any sexually reproducing species.
3. What stage are these cells in?
________________
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100% EVERYDAY.
_____________________
4. A cell has 27 chromosomes. Each of these chromosomes has two sister chromatids. What stage could this
cell be in (1 point)?
5. Explain one similarity and one difference between mitosis and meiosis.
6. Explain one similarity and one difference between Meiosis I and Meiosis II
________________
_____________________
4. A cell has 27 chromosomes. Each of these chromosomes has two sister chromatids. What stage could this
cell be in (1 point)?
5. Explain one similarity and one difference between mitosis and meiosis.
6. Explain one similarity and one difference between Meiosis I and Meiosis II