Question

Division of centromere and movement of two sister chromatids away from each other takes place in

• A. telophase
• B. anaphase
• C. prophase
• D. metaphase

Answer 1

The correct option is B

anaphase

The correct option is B.

Explanation of correct option:

1. Mitosis is a process of cell division that occurs in all cells in the body except reproductive cells.
2. The number of chromosomes in the daughter cells remains the same (i.e. diploid 2n), hence it is called equational division.
3. Mitosis results in the formation of two daughter cells.
4. Prophase, metaphase, anaphase, and telophase are the four stages of mitosis.
5. The centromere is a region, where two chromatids of a chromosome remain attached.
6. During cell division, it is the chromosomal region that attaches to the nuclear spindle.

Anaphase

1. Each chromosome's centromere divides into two at the anaphase stage.
2. The two sister chromatids separate off and begin to move away from one another.

Explanation of incorrect options

Option A:

After reaching their respective poles, the chromatids lengthen and resemble chromatin threads at the telophase stage.

Option C:

The chromosomes get condensed during the prophase stage. They duplicate to produce chromatids.

Option D:

The duplicated chromosomes align themselves in the equatorial plane at the metaphase stage.

Final answer: Division of centromere and movement of two sister chromatids away from each other takes place in anaphase.