Haemophilia is
Autosomal
$Y$-linked
$Z$-linked
$X$-linked
It's Obvious
Sex linked disease is
If a character is always transmitted directly from a father to all his sons and from their sons to all their sons, then which chromosome carries the gene for the character
If a colourblind man marries a woman who is homozygous for normal colour vision, the probability of their son being colourblind is
Colour blindness is
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