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Heredity and Evolution — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHeredity and Evolution1 Mark
MCQ
What determines the sex of a child?
  • A
    Chromosome content of the ovum.
  • ✓
    Chromosome content of the sperm.
  • C
    Number of days between ovulation and fertilization.
  • D
    Number of days between fertilization and implantation.
✓

Answer

Correct option: B.
Chromosome content of the sperm.
Men determine the sex of a baby depending on whether their sperm is carrying an $X$ or $Y$ chromosome. An $X$ chromosome combines with the mother's $X$ chromosome to make a baby girl $(XX)$ and a $Y$ chromosome will combine with the mother's to make a boy $(XY).$

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