Question

Chromosomes get aligned at the centre of the cell during:

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

Answer 1

The correct option is A

Metaphase

The Correct option is A.
Explanation for correct option:

1. The chromosomes which have been replicated and remain joined at the centromere (central point) are called sister chromatids.
2. These chromatids attach to the mitotic spindle and are aligned at the centre of the cell during metaphase.
3. The chromosomal fibres contract to bring the chromosomes over the equator of the spindle.

Explanation for incorrect options:

Option B:

1. During anaphase, centromere divides, and sister chromatids move towards the opposite poles.

Option C:

1. In prophase, the chromatin fibres just condense into chromosomes.
2. Each chromatid is attached to the region of the centromere.
3. The two centrioles begin to move away from each other and produce astral rays.

Option D:

1. Each polar group of chromosomes gives rise to a new nucleus during telophase.
2. For this decondensation of chromosomes happens and chromatin fibres are formed.
3. This is the last stage of karyokinesis.

Final answer:

Chromosomes get aligned at the centre of the cell during metaphase.