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Science · 2025 · 2 marks
CBSE 2025 · Region 3 · Set 3 · Q24
"Sex of the children is determined by type of sex chromosome which they inherit from their father." Justify the statement.
"Sex of the children is determined by type of sex chromosome which they inherit from their father." Justify the statement.
Marking-scheme solution
Males have sex chromosomes XY while females have XX. If the male gamete with X chromosome fuses with the female gamete, then the offspring will be a female child and if the male gamete with Y chromosome fuses with the female gamete, then the offspring will be a male child. Hence, the sex of a child/ children will be determined by the chromosome inherited from the father.
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.