If a colourblind man marries a woman who is homozygous for normal colour vision, the probability of their son being colourblind is
$0$
$0.5$
$0.75$
$1$
Haemophilia $A$ is due to the absence of
Following characters are indicate
$(i)$ presence of sickle - shaped $RBC$
$(ii)$ Blood not clot, non stop bleeding
$(iii)$ The heterozygous female transmit the disease to sons.
$(iv)$ Both heterozygous parents transmit the disease to offspring
A colourblind daughter is born when
In which of the following colourblindness is inherited
If a man who is colour blind marries a women, who is pure normal for colour vision, the chances of their sons have colour blindness is