CBSE 2025 · Region 3 · Set 3 · Q24 · 2 marks
"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 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.