If an albino man marries with a normal woman and $50$ offsprings are albino and $50$ are normal, the woman is
Heterozygous normal
Homozygous normal
Heterozygous carrier
None of these
If the genotype of an individual consists of only one type of genes at same locus. It is called
Polydactyly in man is due to
Disorders of amino acid metabolism results in
The first definite proof of mutagenic action of $X$-rays was given by
In erythroblastosis foetalis, which factors of the mother pass through placenta into the foetus