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Heredity and Evolution — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHeredity and Evolution1 Mark
MCQ
The maleness of a child is determined by :
  • A
    The $X$ chromosome in the zygote
  • ✓
    The $Y$ chromosome in zygote
  • C
    The cytoplasm of germ cell which determines the sex
  • D
    Sex is determined by chance
✓

Answer

Correct option: B.
The $Y$ chromosome in zygote
A male has sex chromosomes $X$ and $Y,$ while a female has $XX$ as sex chromosomes.
During fertilization, the mother always contributes an $X$ chromosome while the father either contributes an $X$ or a $Y$ chromosome.
Hence, the maleness of the child is determined by the presence of the $Y$ chromosome in the zygote contributed by the sperm.

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