Albinism (lack of skin pigmentation) is caused by a recessive allele. A man and woman, both pigmented, have an albino child together. What is the genotype of the albino child? What is the genotype of the parents?

Answer 1

If we use the letter ''A'' for the normal trait, and ''a'' for albinism, then the parents both must be Aa, and the child aa.

Given that albinism is a recessive trait, it cannot manifest unless an individual is homozygous, which explains why the child is aa. Given that both parents have pigmentation, they must both carry the A allele, and since the child is aa, s/he must have inherited these alleles from both parents, one a each.

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Answer 2

Penelope Adams

The albino child's genotype is homozygous recessive (aa). The genotype of both parents is heterozygous (Aa).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.