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A yellow Labrador is mated with a black Labrador - both parents' genotypes are unknown. The...

A yellow Labrador is mated with a black Labrador - both parents' genotypes are unknown. The puppies when born are half yellow [4/8], 3/8 black, and 1/8 chocolate. What are the genotypes of the two parents?

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Answer #1

As per the ratio of the Labrador puppies, 4:3:1. The best option of parental genotype is the Yellow Labrador contains dominant allele(YY) and the Black Labrador contains heterozygous(Yy) allele and here, in this case, the incomplete dominance occurred.

Explanation: Because one of the descendants is Chocolate, that means that specific descendant is the recessive one, where 4 descendants are yellow and that is the highest frequency among the descendants, so there must be a homozygote allele present and it must be dominant in character that's why the highest frequency is observed. So none other than the black one must be heterozygote which shows the incomplete dominance characteristics, a cause of that the black genotype expresses independently.

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