A diploid organism you are studying has 32 chromosomes.

Question

Indicate how many chromatids and individual chromosomes are present in each respective cell produced by this organism at each of the following stages: anaphase 1, metaphase 2, prophase 1, G1 phase of the cell cycle, anaphase 2, mitotic telophase, mitotic anaphase, metaphase 1

Answer 1

During the S (synthesis) phase of interphase the chromosomes are duplicated. Since this organism is stated to have 32 chromosomes, 16 + 16 chromosomes, EACH, were replicated to give us the number 32 ( e.g. similarly, in humans 23 chromosomes from mom and 23 from dad give us a total of 46 chromosomes).

However, note that 64 chromatids are present - since two chromatids, attached to one another at the centromere, make up one chromosome. During prophase and metaphase of mitosis, the same holds true.

However, when anaphase begins, the sister chromatids are separated from each other, and each chromatid is now its own, separate chromosome. Thus, the total # of chromosomes & chromatids are now BOTH = 64. So during both anaphase & telophase, the chromosome number and the chromatids numbers are EQUAL. However, once mitosis has finished - cells have now fully separated with their own membranes - the # of chromosomes and chromatids will BOTH equal 32.

If you still need further help, feel free to contact me. Hope that helped a bit!