Generated by claude-sonnet-4-6 · 2026-06-15 06:54 · grounding rag
Model Answer
(a) Men produce two types of gametes (sperms):
- Sperms carrying X chromosome
- Sperms carrying Y chromosome
(b) No, a male child does not inherit the X chromosome from his father.
Justification: A male child has XY sex chromosomes. He inherits the Y chromosome from his father and the X chromosome from his mother. The father passes the Y chromosome to his son, not the X chromosome.
(c) A human female produces only one type of gamete — the egg (ovum) — all carrying the X chromosome.
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Explanation
- This question is from Chapter 8 (How do Organisms Reproduce?) — specifically the section on sex determination in humans.
- Key point: Father determines the sex of the child (XY father passes either X or Y); mother always contributes X.
- The ½ mark sub-questions need single-line answers; the 1-mark justification needs 2–3 clear lines.
- Examiners look for the correct chromosome names (X and Y), not just "two types."