Question

In which stage of cell division does the chromosome appear in V or I or J shape?

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

Answer 1

The correct option is B

Anaphase

The correct option is B:

Explanation of the correct option:

1. Chromosomes are classified into four categories based on the position of the centromere:
   1. Metacentric: Metacentric chromosomes are those in which the centromere is located in the middle of the chromosomes and produces two equal arms.
   2. Submetacentric: Sub-metacentric chromosomes are those in which the centromere is located somewhat away from the middle of the chromosomes.
   3. Acrocentric: Acrocentric chromosomes are those with the centromere close to the end of the chromosomes.
   4. Telocentric: Telocentric chromosomes are those in which the centromere is located at the end of the chromosome.
2. The sister chromatids shift to opposite poles during the anaphase stage.
3. The metacentric chromosomes take on the shape of a 'V' while this is happening. The telocentric chromosome is shaped like an 'I,' while the sub-metacentric chromosome is shaped like a 'J.'

Explanation of the incorrect option:

Option A:

The first step of the M-phase is prophase, which includes the following events:

1. The spindle has gathered all of the chromosomes and positioned themselves in the cell's centre, ready to divide, during metaphase.
2. The metaphase plate, which is a word for the plane where the chromosomes line up rather than a physical structure, is where all of the chromosomes meet.

Option C:

The second step of the M-phase is metaphase, which includes the following events:

1. During prophase, chromatin, or DNA and protein complexes in the nucleus, condense.
2. The chromatin coils up and grows tighter and tighter, resulting in visible chromosomes.
3. The nuclear membrane starts disappearing.

Option D:

The fourth and last step of the M-phase is telophase, which includes the following events:

1. The cell's chromosomes begin to uncoil, resulting in the production of chromatin.
2. The nuclear envelope begins to re-form.
3. Astral rays vanish
4. Spindle fibres start to separate.
5. Cytokinesis marks the conclusion of the telophase.

Final answer: During anaphase of cell division, the chromosome appears in V or I or J shape.