Question

Meiotic division of the secondary oocyte is completed

• A. After zygote formation
• B. At the time of fusion of a sperm with an ovum
• C. Prior to ovulation
• D. At the time of copulation

Answer 1

The correct option is B

At the time of fusion of a sperm with an ovum

The correct option is B.

Explanation of the correct option:

1. The fusion of sperm with an ovum leads to the meiotic division of the secondary oocyte.
2. The secondary oocyte is produced by meiosis I in the primary oocyte.
3. The meiotic division of the secondary oocyte is arrested at the Metaphase II phase of meiosis II.
4. The division is completed after fertilization of the ovum by the sperm.

Explanation of the incorrect option:

Option A:

After zygote formation, it undergoes mitotic division and develops into the embryo.

Option C:

1. Meiotic division does not complete after ovulation.
2. It is arrested at the metaphase II of meiosis II.

Option D:

At the time of copulation, no such division takes place.

Final answer: Meiotic division of the secondary oocyte completed at the time of fusion of a sperm with an ovum.