NEET Biology question

BiologyPrinciples of Inheritance and VariationNEET

Human skin colour is controlled by several gene pairs. Assume there are just three gene pairs on different chromosomes, each with two alleles showing incomplete dominance for melanin deposition. If a very dark skinned person marries a very light skinned woman, what will be the chance that their offspring will have very dark skin?

Answer: (A)

Solution

The very dark parent is homozygous for the melanin-depositing allele at all three loci and the very light parent is homozygous for the non-depositing allele at all three loci, so every offspring is necessarily heterozygous at all three loci (an intermediate, medium-toned phenotype); since

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Question ID VK-119631