A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. Thus boy
Will be partially colour blind since he is heterozygoustor for the colour blind mutant alble
Must have normal colour vision
Must be colour blind
May be colour blind or may be of normal vision,
Phenylketonuria is a genetic disorder due to a defect in metabolism of the following.
Which one of the following symbols and its representation, used in human pedigree analysis is correct ?
In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased? (In $\%$)
If a father and son are both defective in red-green colour vision, is it likely that the son inherited the trait from his father ? Comment.