Name: ___________________________ Period: ____________ Date: _____________________
How Cells Divide: Meiosis
Worksheet to accompany PBS Nova Animation
http://www.pbs.org/wgbh/nova/baby/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
3. For each of the following diagrams, draw the chromosomes of the mother in one color and the
chromosomes of the father in a different color.
Key:
Chromosomes from father = [ ]
Chromosomes from mother = [ ]
Draw the cell as it appears during this
stage. Label the following parts:
- Nuclear envelope
- Nucleolus
- Chromatin
- Centrioles
Step 2 – Interphase I
4. What replicates during this time?
Draw the cell as it appears during this
stage. Label the following parts:
- Nuclear envelope
- Nucleolus
- Chromatin
- Centrioles
Written by James Dauray
http://www.docstoc.com/profile/jamesdauray
Page 1
Step 3 – Prophase I
5. What occurs during this stage of meiosis that does not occur during mitosis?
Draw the cell as it appears during this
stage. Label the following parts:
- Nuclear envelope
- Spindle fibers
- Chromosomes
- Centrioles
Step 4 – Prometaphase I (skip this stage)
Step 5 – Metaphase I
6. How is this stage different than metaphase of mitosis?
Draw the cell as it appears during this
stage. Label the following parts:
- Chromosomes
- Spindle fibers
- Centrioles
Step 6 - Anaphase I
7. How is this stage different than anaphase of mitosis?
Draw the cell as it appears during this
stage. Label the following parts:
- Chromosomes
- Spindle fibers
- Centrioles
Written by James Dauray
http://www.docstoc.com/profile/jamesdauray
Page 2
Step 7 – Telophase I
8. How is this stage different than telophase of mitosis?
Draw the cell as it appears during this
stage. Label the following parts:
- Chromosomes
- Nuclear envelope
- Centrioles
- Spindle Fibers
Step 8 – Cytokinesis- End of Meiosis I
Draw the cell as it appears during this
stage. Label the following parts:
- Chromosomes
- Nucleolus
- Centrioles
- Nuclear envelope
Step 9 – Interphase II
9. Does the DNA divide during this stage?
10. Are the new cells considered haploid or diploid at this stage? Explain.
11. Is each chromosome made of one or two sister chromatids at this stage?
Step 10 – Prophase II
12. Does crossing-over occur during this stage?
Draw the cell as it appears during this
stage. Label the following parts:
- Chromosomes
- Centrioles
- Nuclear envelope
Written by James Dauray
http://www.docstoc.com/profile/jamesdauray
Page 3
Step 11 – Prometaphase II (Skip this stage)
Step 12 – Metaphase II
Draw the cell as it appears during this
stage. Label the following parts:
- Chromosomes
- Spindle fibers
- Centrioles
Step 13 – Anaphase II
Draw the cell as it appears during this
stage. Label the following parts:
- Spindle fibers
- Chromatids
- Centrioles
Step 14 – Telophase II
Draw the cell as it appears during this
stage. Label the following parts:
- Spindle fibers
- Nuclear envelope
- Chromatids
- Centrioles
Step 15 – Cytokinesis – End of Meiosis II
13. At the end of this stage, are the cells considered haploid or diploid? Explain.
14. At this point, are the chromosomes made of one or two sister chromatids?
15. What are the only types of cells that are produced with this type of cell division?
16. Are the daughter cells genetically identical to the parent cell? To each other?
Draw the cell as it appears during this
stage. Label the following parts:
- Chromatids
- Nuclear envelope
- Centrioles
Written by James Dauray
http://www.docstoc.com/profile/jamesdauray
Page 4