Question

After the entry of sperm into cytoplasm of ovum which of the following event takes place ?
a) Mitotic division of secondary oocyte
b) Meiotic division of primary oocyte
c)Mitotic division of secondary oocyte
d) Meiotic division of secondary oocyte​

Answer 1

Answer:

(B)

Explanation:

Meiotic division of primary oocyte

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Answer 2

After the entry of sperm into the cytoplasm of ovum, b) Meiotic division of the primary oocyte

Explanation:

1. Many oogonia are formed during the growth of the fetus, which enters mitosis and forms primary oocytes that stay in the prophase of meiosis I until childhood. Primal oocytes are surrounded by a single layer of cells called granulosa cells, which create primordial follicles.
2. One primordial follicle per month grows into a mature follicle, known as a Graafian follicle, throughout a woman's reproductive years. When the primary oocyte divides through meiosis I, it produces a secondary oocyte and the first polar body.
3. The haploid secondary oocyte is a haploid oocyte. The second meiotic division continues until a sperm unites with the oocyte, which takes place in metaphase.
4. When sperm and egg merge during fertilisation, the secondary oocyte undergoes a second meiotic division, resulting in a big cell, the ovum, and a second polar body.