Question

which of the following event also occur in the foetus before it is born.

a. Degeneration of follicle
b. Formation of the first polar
c. Formation of primary oocyte
d. Formation of secondary oocyte​

Answer 1

Answer:

C

Explanation:

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Answer 2

Answer will be option C.

Explanation:

• gametogenesis begins in the embryonic stage in female.
• From second to seventh month of pregnancy , oogonium is continuously mitotically divide to increase their number. and then few oogonium give rise to primary oocyte by mitosis.
• After seventh month, number of germ cells drop rapidly and only few primary oocyte survive and enter meiosis I and get arrested in diplotene stage of prophase I and remain in this stage until puberty.
• Before birth, primordial follicle grow into developing follicle that contain primary oocyte.
• After birth, approximately 12 years later, groups of primary oocytes periodically resume meiosis.
• Each primary oocyte complete meiosis and produce a secondary oocyte and first polar body .
• the resulting secondary oocyte enter meiosis II and arrested at metaphase II.
• Follicle rapidly enlarge and mature and ruptured or degenerate at the surface of ovary.
• Releasing secondary oocyte.
• After fertilization, meiosis of secondary oocyte will complete. and secondary oocyte give rise to ovum and a second polar body.
• so, before born, primary oocyte formation takes place in female.