If there are 40 centromeres in a cell at anaphase of mitosis, how many chromosomes will be found in each daughter cell following cytokinesis?

• A. 10.
• B. 20.
• C. 40.
• D. 80.

Answer: (B)

Verified step by step guidance

1. Understand the role of centromeres: Centromeres are the part of a chromosome that links sister chromatids. During anaphase of mitosis, the centromeres split, allowing the sister chromatids to separate and move to opposite poles of the cell.
2. Recognize the significance of anaphase: At anaphase, each centromere splits, and the sister chromatids are pulled apart. This means that the number of centromeres at anaphase is equal to the number of chromatids present.
3. Determine the number of chromatids: Since there are 40 centromeres at anaphase, there are 40 chromatids. Each chromatid will become an individual chromosome in the daughter cells.
4. Calculate the number of chromosomes in each daughter cell: After cytokinesis, the cell divides into two daughter cells. Each daughter cell will receive half of the chromatids, which means each will have 20 chromosomes.
5. Conclude the process: Cytokinesis completes the cell division, resulting in two daughter cells, each with 20 chromosomes, derived from the original 40 chromatids present at anaphase.