Given below is a pedigree chart showing the inheritance of a certain sex- linked trait in humans.
The trait traced in the above pedigree chart is
Dominant $X$-linked
Recessive $X$-linked
Dominant $Y$-linked
Recessive $Y$-linked
Mendelian disorder may be of
Which of the following is a genetic disease
A colourblind daughter is born when
A woman has a haemophilic son and three normal children. Her genotype and that of her husband with respect to this gene would be