Steps of Meiosis Investigation & Modeling Worksheet. Name:______
For the numbers, title each phase of meiosis. Illustrate (with color) the events and chromosomes in the cells along the left. Make sure to use one color for mom’s DNA and another for dad’s DNA. Describe the major events that happen in each stage in the lines on the right.
1. ______
______
2. ______
______
3. ______
______
4. ______
______
5. ______
______
6. ______
______
7. ______
______
8. ______
______
Answer these questions by underlining the right word or completing the blanks to form complete sentences.
9. Meiosis is the process that creates (#______) (haploid or diploid) (sex cell or gametes) from 1 (haploid or diploid) (sex cell or gametes).
10. In the beginning of human meiosis the ______cell is (diploid or haploid), containing (# _____) sets of (#_____) chromosomes. Another way to write this is _____n = ______.
11. In the end, (#_____) ( diploid or haploid) gametes are formed. Another way to write these gametes is _____n = ______.
12. Male gametes are called ______and female gametes are celled ______.
13. In meiosis, genetic variation is caused by 2 events; ______-______in the ______stage of meiosis, and ______in the ______& ______stages.
14. Independent assortment is: ______.
15. Compare and contrast mitosis and meiosis.
16. If one germ cell of a dog (2n = 78) undergoes meiosis and another cell undergoes mitosis, how many cells will result in each process and how many chromosomes will each resulting cell contain?
Answer 16 & 17 below. Draw arrows or lines to each feature.
17. This is one sex cell that is about to enter metaphase I of meiosis I. This cell is (diploid or haploid). Label the following features, including the number of each:
- Set of homologous chromosomes.______
- Chromosomes:______
- Chromatid:______
- Tetrad:______
- Which set is from mom and which is from dad?
18. These are the resulting gametes that are formed from one sex cell going through meiosis in telophase II. These cells are (diploid or haploid). Label the following features, including the number of each:
- Homologous chromosomes.______
- Chromosomes:______
- Chromatid:______
- Tetrad:______
19. Below, draw one tetrad going through the cross-over event. In three separate stages (beginning, middle, and end) show how the DNA is exchanged, resulting in 4 unique chromosome banding patterns. Illustrate each chromosome in a different shade to show which one is mom’s and which one is dad’s original DNA.