A colourblind man has a colourblind sister but a normal brother than phenotype of its parents is
Father colourblind and mother normal
Father normal and mother colourblind
Father and mother both are colourblind
Father and mother both are normal
One of the genes present exclusively on the $X$-chromosome in humans is concerned with
Sex linked disease is
Which one is the incorrect statement with regard to the importance of pedigree analysis?
If a normal woman marries a colourblind man, their
The amino acid substituted in sickle cell anaemia is