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  4. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/biology/dc73f6ff65198a6fa466b5bb81a893f8-.jpeg /> If A = normal allele, a = albino allele, then genotypes of father and mother are respectively

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If $A =$ normal allele, $a =$ albino allele, then genotypes of father and mother are respectively

Principles of Inheritance and Variation

Solution:

Albinism is hereditary lack of pigmentation in an organism. It is an autosomal recessive disorder. Albino humans lack dark pigment melanin in their skin, hair or eyes. The allele responsible is recessive to allele for normal pigmentation. Father's and mother's genotype should be $Aa$. They both are carriers of the disease.
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The chances of this couple's fifth child being an albino are $1$ in $4$.