Color blindness is caused by:

Which of the following abnormalities is due to an autosomal dominant mutation?

Alkaptonuria is caused due to

Given below is a pedigree chart showing the inheritance of a certain sex-linked trait in humans. The trait traced in the above pedigree chart is

Which one of the following disorders is caused by the substitution of Glutamic acid (Glu) by Valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule?

If a colour blind man marries a woman who is homozygous for normal vision,the probability of their son being colour blind is ......... (in $\%$)