Pedigree analysis is $NOT$ useful for which of the following purposes?

If a mother is a carrier for colour blindness and the father is normal,then in the offspring,this disease may be seen in:

Given below are the two statements.
Statement $I$: Widow's peak is determined by an autosomal dominant gene.
Statement $II$: Heterozygous individuals have a straight hairline.
In the light of the above statements,choose the correct answer from the options given below:

$A$ normal woman,whose father was colour blind,marries a normal man. What is the chance of occurrence of colour blindness in the progeny (in $;\%$)?

Examples of congenital diseases are

$A$ colorblind man marries a normal woman whose father was colorblind. Among their two sons and two daughters,who will be colorblind?