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ZoologyNEET 2025Gametogenesis and menstrual cycle

Human Reproduction

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. The luteinising hormone (LH) surge leads to disintegration of the endometrium and onset of menstrual bleeding.

Choose the correct answer from the options given below:

  1. A.A and B are true✓
  2. B.A and C are true
  3. C.B and D are true
  4. D.B and C are true

Solution

Oogenesis begins in the foetal ovary, long before spermatogenesis starts at puberty (A true). In males meiosis I and II follow each other quickly; in females meiosis I halts before birth and meiosis II completes only at fertilisation (B true). The first polar body accompanies the secondary oocyte (C false); the LH surge triggers ovulation, not menstruation (D false). Hence A and B.

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