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Mr. Kapoor has Bb autosomal gene pair and d allele sex-linked. What shall be proportion of Bd in sperms?

1. Zero
2. 1/2
3. 1/4
4. 1/8

Correct answer: 1/4

Solution

For the autosomal pair Bb, half the sperms carry B and half carry b. If the sex-linked d allele is present in only one of the two sex chromosomes, only half the sperms receive it, so the combined probability of Bd is 1/2 × 1/2 = 1/4.

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