Question

The centromere divides into two during

• A. Prophase
• B. Metaphase
• C. Anaphase
• D. Telophase

Answer 1

The correct option is C

Anaphase

The correct option is C.

Explanation of the correct option

1. Mitosis is the process through which cells duplicate their own DNA. Mitosis is the process through which a single parent cell divides into two identical daughter cells. The chromosomes containing DNA are replicated before mitosis, and the sister chromatids that have been replicated stay attached.
2. Chromosomes are condensed, microtubule spindle fibres develop, and chromosomes align on the metaphase plate before anaphase.
3. When separating breaks the cohesion that binds the sister chromatids together at the start of anaphase, they start to separate. When the nuclear envelope reforms and the chromosomes start to unravel, anaphase ends and telophase and cytokinesis begin.
4. They can begin to function on their own again after they are loose and the cells have been divided. Interphase begins after cell division ends.

Explanation of the incorrect options

Option A:

1. Over 50% of mitotic division occurs during the prophase. Centrosomes that have been replicated begin to migrate to opposite ends of cells. Mitotic apparatus is made up of microtubules that emanate from the centrosomes and spindle fibres.
2. Chromosomes have been found to condense into tight structures.

Option B:

1. Metaphase is a stage in the cell division process.
2. Individual chromosomes are rarely visible in the nucleus of a cell.
3. The chromosomes condense and become distinct during metaphase of meiosis, however, as they align in the middle of the dividing cell.

Option D:

1. The chromosomes are enclosed in nuclei during telophase I.
2. The cell now goes through cytokinesis, which separates the original cell's cytoplasm into two daughter cells.
3. Each daughter cell is haploid, with only one set of chromosomes, or half of the mother cell's total number of chromosomes.

Final Answer: The centromere divides into two during anaphase.