Give scientific reasons : The product of phenylalanine catabolism excreted in the urine in phenylketonuria.
It is a rare disease in which individual lacks an enzyme called Phenylalanine hydroxylase. Which is needed to breakdown an essential amino acid phenylalanine into tyrosine in liver. This phenylalanine is accumulated and gets converted into phenylpyruvic acid and other derivatives
leading to mental retardation (due to accumulation in brain). These are also excreted through urine because of its poor absorption by kidney.
A colourblind man has a colourblind sister but a normal brother than phenotype of its parents is
If mother is a carrier for colour blindness and father is normal, then in the offsprings this disease may be seen in
The female children of a haemophilic man and a carrier woman are likely to be
Colour blindness in man is