Notes

Slide Show

Outline

1	Mitosis/Meiosis Exercise
2	G₁ Interphase
3	G₂ Interphase
4	Prophase
5	Metaphase
6	Anaphase
7	Telophase
8	G₁ Interphase
9	G₂ Interphase
10	Meiosis
11	G₂ Interphase
12	Prophase I
13	Metaphase I - Alternative 1
14	Metaphase I - Alternative 2
15	Alternative 1 Summary Diagram
16	Alternative 2 Summary Diagram
17	Metaphase I - Alternative 1
18	Anaphase I - Alternative 1
19	Telophase I - Alternative 1
20	Interkinesis, then Prophase II Alternative 1
21	Metaphase II - Alternative 1
22	Anaphase II - Alternative 1
23	Telophase II - Alternative 1
24	Haploid cells - Alternative 1
25	Metaphase I - Alternative 2
26	Anaphase I - Alternative 2
27	Telophase I - Alternative 2
28	Interkinesis, then Prophase II Alternative 2
29	Metaphase II - Alternative 2
30	Anaphase II - Alternative 2
31	Telophase II - Alternative 2
32	Haploid Cells - Alternative 2
33	Answers- Question #5 The answers to questions 5a through 5e can be found in the Meiosis reading assignment in The Biology Web. Scroll down to Oogenesis.
34	Questions 6a and 6b 6a) What percentage of her body cells will contain the gene for blond hair? To answer this question, you need to know that all of her body cells were descended from a fertilized egg by the process of mitosis. Mitosis produces identical daughter cells, therefore all of her body cells are identical. If she has a gene for blond hair in any cell, they will all have the gene. 6b) What percentage of her primary oocytes contain the gene for blond hair? Primary oocytes have not undergone meiosis. Therefore, they are identical to her body cells.
35	Question 6c If cell A were in prophase I, how many genes for blond hair would be in the cell? The genotype of the person is Aa, so one of her chromosomes contains a gene for blond hair and the other one contains a gene for brown hair. At the start of meiosis, each chromosome has two identical chromatids. There is a gene for blond hair on one of the chromosomes but that chromosome has two identical chromatids. Therefore, there are two copies of the gene on that chromosome.
36	Question 6d If cell “C” (first polar body) contains a gene for blond hair, what gene does cell B (secondary oocyte) contain? During the first meiotic division, homologous chromosomes separate and travel to opposite sides of the cell. The cell then splits with one of the chromosomes going into one of the daughter cells (the secondary oocyte- cell B) and the other going in the other (the polar body- cell C). The gene for blond hair is on one of the chromosomes and the gene for brown hair is on the homologous chromosome.
37	Question 6e If cell “D” contains the gene for blond hair, what gene does cell “E” contain? Cells D and E are produced by the second meiotic division. The second meiotic division is equivalent to mitosis. Mitosis produces two identical daughter cells.
38	Question 6f If cell “D” contains the gene for blond hair, what gene does cell “F” contain? Cell D is identical to B and cell F is identical to cell C, therefore the answer to this question is similar to the answer to question 6d above.