Question

Consider the following:

1. The reductive division for the human female gametogenesis starts earlier than that of the male gametogenesis.
2. The gap between the first meiotic division and the second meiotic division is much shorter for males compared to females.
3. The first polar body is associated with the formation of the primary oocyte.
4. Luteinising Hormone (LH) surge leads to disintegration of the endometrium and onset of menstrual bleeding.

Choose the correct answer from the options given below:

Options

• A and B are true

• A and C are true

• B and D are true

• B and C are true

Answer 1

A and B are true

Explanation:

In females, meiosis begins earlier than in males. In females, it begins around the 12th week of pregnancy during fetal development and continues through prophase I until puberty. The interval between meiosis I and II is shorter (continuous and rapid) in males, whereas it is longer in females, where meiosis II doesn’t finish until after fertilisation. After meiosis I, which signifies the production of the secondary oocyte rather than the primary oocyte (the primary oocyte already exists from fetal life), the first polar body is created. Ovulation, not menstruation, is caused by an LH surge. If fertilisation fails, a decrease in progesterone and estrogen causes menstruation.