The disease 'Haemophilia' is caused due to the lack of:

$A$ normal-visioned man,whose father was color-blind,marries a woman whose father was also color-blind. What is the probability that their first child,a daughter,will be color-blind (in $\%$)?

Select the correct statement regarding colour blindness.

Which of the following is a genetic disorder?

If a colour blind man marries a normal visioned woman,what is the percentage of offsprings showing colour blindness phenotypically (in $\%$)?

What does the given pedigree chart indicate?