What are the stages of the cells in meiosis in the diagrams above? And what is m

Question

What are the stages of the cells in meiosis in the diagrams above? And what is most likely the sex of the individual?

For a-d I got a. Anaphase I b. Anaphase II c. Anaphase II d. Prophase I

I just dont know how the second diagram fits in with the rest since it seems to have twice as many chromosomes, and is Anaphase II the correct stage?? I think the diploid number is 6, but I dont know how to determine the sex of the invdividual from an incomplete karyotype. Any help is greatly appreciated!! Thank you!!

3. The following images (a-d) represent chromosomes from different cells of a mammal during cell division. a) b) c) d) Indicate which stage of meiosis or mitosis is taking place for each type of division (make sure to indicate if the stage is from meiosis I or meiosis ID). a. b. C. d. e. What is the most likely sex of the individual? Why? f. What is the diploid chromosome number of the animal?

Explanation / Answer

3.

a. Homologous chromosomes are separated in this stage, hence the cell is in the anaphase I stage of meiosis.

b. From the question, it is informed that these are the stages of cell division not only the stages of meiosis. In the diagram total 12 chromosomes are shown. After division each cell with get 6 number of chromosomes. There is no reduction in chromosome number so it is the anaphase of mitosis.

c. In this image we can clearly see that sister chromatids are separated and the number of chromosomes in each cell will be 3. So there is reduction in chromosome number. Hence it is anaphase II of meiosis.

d. There is no spindle fibre formed in the cell but homologous chromosome are in pairing condition. It is the identity of zygotene substage of prophase I of meiosis.

e. The most likely sex of the individual is female. There is no X-Y pairing found in any cell. X chromosomes are much longer than the Y chromosome. As because there is no Y chromosome present in the cell the individual will be female by default.

f. The anaphase I stage always states the diploid chromosome number of the individual. From the figure it is clear that there are 6 number of chromosomes in the cell. So the diploid chromosome number of the animal is 6.

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