In man,albinism is due to the non-synthesis of melanin in the absence of:

$A$ man whose father was colorblind marries a woman who has a colorblind mother and a normal father. What is the percentage probability of their male children being colorblind (in $\%$)?

Pedigree analysis plays an important role in genetic disorders.

Which blood clotting factors are deficient in Hemophilia-$A$,Hemophilia-$B$,and Hemophilia-$C$,respectively?

Choose the correct option for the offspring of a colorblind woman and a normal man.

Given that $X^h$ is the chromosome with the gene for haemophilia and $X$ is the chromosome with the normal gene. Which of the following individuals will act as a carrier for haemophilia?