Question

A woman with normal vision marries a man with normal vision gives birth to a colour blind son.Her husband dies and she re-marries a colour blind man What is the probability of her children having abnormality?​

Answer 1

Colour blindness is a X-linked recessive disorder. Son gets its X chromosome from the mother, hence the normal mother of a colour blind son will be carrier (X^cX). Among the children of a carrier female (X^cX) and colour blind man (X^cY), 50% sons and 50% daughters will be affected.

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