Albinism is a recessive trait. A man and woman both show normal pigmentation, but both have one parent who has albinism (without melanin pigmentation). The probability that their first child will have albinism is (C) 1 / 4 .
Albinism is an autosomal recessive trait. It is only possible for an individual to have albinism if the genotype depicts a homozygous recessive condition.
The recessive allele associated with albinism is represented by the letter 'a' and an individual must contain the genotype 'aa' in case of albinism.
Since both the parents show normal pigmentation but both have one parent that has albinism (aa), therefore, the man and the woman must have the genotype 'Aa'.
On crossing Aa x Aa, we will get four offspring with three possible genotypes i.e. AA, Aa and aa in the ratio 1 : 2 : 1.
Thus, there is a probability of 1/4 that their first child will have albinism.
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