A woman has a haemophilic son and three normal children. Her genotype and that of her husband with respect to this gene would be
A sex linked recessive gene $C$ produces red green colour blindness in humans. A normal woman whose father was colourblind marries a colourblind man. Of all the girls born to these parents what percentage is expected to be colourblind
A colourblind daughter is born when
Give scientific reasons : The product of phenylalanine catabolism excreted in the urine in phenylketonuria.
Which one is ineffective against antibiotics