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Genotype of carrier parents is – Aa (male parent) × Aa (female parent).

1. (a) AA = normal child (25%)
2. (b) Aa = carrier child (50%)
3. (c) aa = affected child (25%)
4. (d) None of these

Correct answer: (b) Aa = carrier child (50%)

Solution

A cross between two carriers (Aa × Aa) produces offspring in a 1:2:1 genotype ratio: AA, Aa, Aa, aa. Therefore, heterozygous carrier children (Aa) make up 50% of the offspring.

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