$A$ normal woman,whose father was color-blind,marries a normal man. What will be the status of their sons?

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased? (In $ \%$ )

$A$ normal-visioned man whose father was colourblind marries a normal woman whose father was also colourblind. They have one son. What is the probability of the son being colourblind (in $\%$)?

Pedigree analysis plays an important role in genetic disorders.

Females rarely experience the physiologic defect of haemophilia because they do so only when they are:

What does the given pedigree chart indicate?