Consider the following :
A. The reductive division for the human female gametogenesis starts earlier than that of the 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.
Choose the correct answer from the options given below:
- A
B and C are true
- B
A and B are true
- C
A and C are true
- D
B and D are true
A is true: In females, meiosis I begins during foetal development and is arrested for years, whereas in males spermatogenesis (and its meiosis) only begins at puberty.
B is true: In males meiosis I is followed quickly by meiosis II, while in females meiosis II is completed only at fertilisation — a gap of many years.
C is false: The first polar body is released during the formation of the secondary oocyte, not the primary oocyte.
D is false: The LH surge triggers ovulation. Endometrial breakdown is caused by the fall in progesterone in the late luteal phase.
Only A and B are true.
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