Phenylketonuria is a genetic disorder due to a defect in metabolism of the following.
Polysaccharides
Fatty acids
Vitamins
Amino acids
Study the given pedigree chart and select the correct option of the given question.
$(1)$ Is the trait recessive of dominant ?
$(2)$ is the trait sex linked or autosomal ?
Given below is a highly simplified representation of the human sex chromosomes from a karyotype.
The genes $a$ and $b$ could be of
A woman with two genes for haemophillia and one gene for colourblindness on one of the $X$ chromosomes marries a normal man. How will the progeny be
Which is correct for inheritance of autosome linked recessive gene?
Sickle cell anaemia is due to