Phenylketonuria is an inborn error of metabolism that is inherited as:

Which one in man is a wholly genetic trait?

In the given pedigree chart,which Mendelian disorder is represented?

$A$ woman has normal vision but some of her sons and daughters are colorblind. What will be the genotype of the woman and her husband?

$A$ normal-visioned man whose father was colourblind marries a normal woman whose father was also colourblind. They have one son. What is the probability of the son being colourblind (in $\%$)?

Colour blindness is