Sickle cell anaemia is due to

Which of the following is a sex-linked character?

What is the full form of $PKU$?

Mendelian disorders may be of which type?

$A$ normal-visioned woman, whose father is colour-blind, marries a normal-visioned man. What would be the probability of her sons and daughters being colour-blind? Explain with the help of a pedigree chart.

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