A woman who appears very fair skinned but has one dominant gene for skin color. She...

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A woman who appears very fair skinned but has one dominant gene for skin color. She marries a man who is white totally recessive for skin color). Explain if any of their children have dark skin (i.e. darker than their mothers). 18.

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Answer 1

Answer #1

Let us consider the genotype of mother as Dd where D is a dominant allele and d is a recessive allele. The fair skin is due to the dominant allele "D".

She marries a man who is white and he is totally recessive for the phenotype white. Let us consider his genotype as DD

Now we shall find out the possible genotypes and phenotypes of their offspring

Dd x DD

DD, DD, Dd, Dd

From the above cross we could make out that all of the offspring are white. Hence, none of their children will have dark skin.

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Answer 2

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