A woman has a haemophilic son and three normal children. Her genotype and that of her husband with respect to this gene would be
$X X \wedge X^{h} Y$
$X^{h} X^{h} \wedge X^{h} Y$
$X^{h} X^{h}$ and $X Y$
$X^{h} X \wedge X Y$
In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.
Colour blindness results from
Haemophilia is more commonly seen in human males than in human females because
Persons who are colour blind cannot distinguish
In pedigree analysis, the square, blackened and horizontal lines represents