Phenylketonuria is an inborn error of metabolism that is inherited as:

Albinism is caused by an autosomal recessive disorder. $A$ couple has their first child who is an albino (having abnormal skin pigmentation). What is the probability that their second child will also be an albino (in $\%$)?

Alkaptonuria is a condition in which

When a hemophilic male $(X^h Y)$ marries a carrier female $(X^H X^h)$ for hemophilia,what are the chances of all daughters born being normal (in $\%$)?

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 $\%$)?

Study the given pedigree chart.