Most studies on human genetics have been made through

Given below is a pedigree showing the inheritance of Myotonic Dystrophy,an autosomal dominant disorder. The genotypes of person $1, 2$ and $3$ in this family tree are:

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 $\%$)?

In humans,color blindness is caused by:

The female children of a haemophilic man and a carrier woman are likely to be:

Which one of the following is a sex-linked trait?