Question

Consider the following:
A. The reductive division for human female gametogenesis starts earlier than that of male gametogenesis.
B. The gap between the first meiotic division and the second meiotic division is much shorter for males compared to females.
C. The first polar body is associated with the formation of the primary oocyte.
D. Luteinizing Hormone (LH) surge leads to disintegration of the endometrium and onset of menstrual bleeding.

• A. A and C are true
• B. B and D are true
• C. B and C are true
• D. A and B are true

Hint:

Female meiosis: Starts early, long pause. Male meiosis: Starts later, continuous.

Answer 1

The Correct Option is D

A. True: Meiosis I in females begins during fetal development and is arrested until puberty. In males, meiosis I begins at puberty.
B. True: In males, meiosis I and II proceed relatively continuously. In females, there's a long delay between meiosis I (completed at ovulation) and meiosis II (completed only upon fertilization).
C. False: The first polar body is formed during meiosis I, which results in a secondary oocyte, not a primary oocyte.
D. False: The LH surge triggers ovulation. Menstrual bleeding is caused by a drop in progesterone and estrogen levels if fertilization doesn't occur.