A boy is colour blind, in his two sisters one is colour blind and one is carrier $(normal)$. Then who is colour blind in his family
Father
His grand father and mother
Mother
His grand father
Haemophilic female marries normal male, the theoretical ratio of their offsprings regarding haemophilia will be
Genes for colour blindness is carried by
$I.$ Abnormal development
$II.$ Father
$III.$ Mother
$IV.$ Autosomes
A colour blind man marries the daughter of a colour blind person. Then in their progeny
Colour blindness is
Given below is a highly simplified representation of the human sex chromosomes from a karyotype. The gene $'a'$ and $'b'$ could be of