Name: ________________________________
Period: ____________
Score: _______/25
How Cells Divide: Meiosis
http://www.pbs.org/wgbh/nova/miracle/divide.html
Step 1 – Before We Split
1. How many chromosomes are in the human genome?
2. How many chromosomes are in a sperm or egg cell?
Step 2 – Interphase I
3. What replicates during this time?
Step 3 – Prophase I
4. What occurs during this stage of meiosis that does not occur during mitosis?
Step 4 – Prometaphase I
5. How is this stage the same as prometaphase of mitosis?
Step 5 – Metaphase I
6. How is this stage different than metaphase of mitosis?
Step 6 - Anaphase I
7. How is this stage different than anaphase of mitosis?
Step 7 – Telophase I
8. How is this stage different than telophase of mitosis?
Adapted worksheet written by James Dauray (http://www.docstoc.com/profile/jamesdauray)
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Step 8 – Cytokinesis
9. During this stage does mitosis or meiosis end?
Step 9 – Interphase II
10. Does the DNA divide during this stage?
11. Are the new cells considered haploid or diploid at this stage? Explain.
12. Is each chromosome made of one or two sister chromatids at this stage?
Step 10 – Prophase II
13. Does crossing-over occur during this stage?
Step 11 – Prometaphase II
14. Describe what occurs during this stage:
Step 12 – Metaphase II
15. Describe what occurs during this stage:
Step 13 – Anaphase II
16. Describe what occurs during this stage:
Step 14 – Telophase II
17. Describe what occurs during this stage:
Adapted worksheet written by James Dauray (http://www.docstoc.com/profile/jamesdauray)
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Step 15 – Cytokinesis – End of Meiosis II
18. At the end of this stage, are the cells considered haploid or diploid? Explain.
19. At this point, are the chromosomes made of one or two sister chromatids?
20. What are the only types of cells that are produced with this type of cell division?
21. Are the daughter cells genetically identical to the parent cell? To each other?
Test your knowledge 17-1 (Mitosis and Meiosis: Pg. 426 – 429)
1. Cells with half the number of chromosomes used for sexual reproduction are know as:
a. Zygotes
b. Daughter cells
c. Gametes
d. Half cells
2. Organs that produce sperm and egg are called
a. Gametes
b. Gonads
c. Zygotes
d. Chromosomes
3. After___________, the egg is called a ____________ and has 46 chromosomes.
a. Reproduction, gamete
b. Meiosis, daughter cell
c. Mitosis, zygote
d. Fertilization, zygote
4. Explain how Down’s Syndrome occurs:
Adapted worksheet written by James Dauray (http://www.docstoc.com/profile/jamesdauray)
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