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(B) Albinism is an autosomal recessive trait. Let the normal allele be $A$ and the albino allele be $a$.Since the parents have normal skin pigmentatio

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(B) Albinism is an autosomal recessive trait. Let the normal allele be $A$ and the albino allele be $a$.Since the parents have normal skin pigmentation but produced an albino child $(aa)$,both parents must be carriers (heterozygous,$Aa$).The cross is $Aa 	imes Aa$.The Punnett square results in the following genotypes: $AA$ (normal),$Aa$ (normal carrier),$Aa$ (normal carrier),and $aa$ (albino).The probability of having an albino child $(aa)$ in any given pregnancy is $1/4$ or $25\%$.Therefore,the probability that their second child will be an albino is $25\%$.

Albinism is known to be due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino (in $\%$)?

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