A normal woman whose father was albino marrie | vedclass

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Question

(A) Albinism is an autosomal recessive trait. Let $A$ be the dominant allele for normal pigmentation and $a$ be the recessive allele for albinism.$1$.

Vedclass · Accepted Answer

$1$ normal : $1$ albino

Vedclass · Answer

(A) Albinism is an autosomal recessive trait. Let $A$ be the dominant allele for normal pigmentation and $a$ be the recessive allele for albinism.$1$. The woman is normal but her father was albino $(aa)$,so she must carry one recessive allele. Her genotype is $Aa$.$2$. The man is albino,so his genotype must be $aa$.$3$. The cross is $Aa 	imes aa$.$4$. The Punnett square results in offspring genotypes: $50\%$ $Aa$ (normal) and $50\%$ $aa$ (albino).$5$. Therefore,the ratio of normal to albino offspring is $1:1$.

$A$ normal woman whose father was albino marries a man who is albino. What proportion of normal and albino can be expected among their offspring?

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