AP BIOLOGY

Detailed explanation-1: -Now that there are 20 chromatids, they should be in identical pairs of two (sister chromatids ) because replication has occurred. So, there would be 10 centromeres.

Detailed explanation-2: -If there are 20 centromeres in anaphase, there are 20 chromosomes within the dividing cell. As a result, each end pole of the dividing cell will receive 10 chromatids, with each chromatid becoming a chromosome for the cell.

Detailed explanation-3: -As centromeres join two chromatids hence 20 chromatids will contain 10 chromosomes each joining two chromatids.

Detailed explanation-4: -Answer and Explanation: In a replicated chromosome, a structure called centromere keeps the two daughter strands of this chromosome together. The microtubules of the mitotic spindles are attached to it. Therefore, a cell having 20 centromeres will have 20 chromosomes.