In human the inheritance of sex linkage takes place through
Autosome
$Y$ - chromosome
$X$ -chromosome
Both $(b)$ and $ (c)$
The evidence that crossing over occurs at four stranded stage and not at two stranded stage of the chromosomes, comes from
Polytene chromosomes in salivary glands of are formed as a result of
Gene which suppresses other gene’s activity but does not lie on the same locus is called as
An abnormal human baby with $‘XXX’$ sex chromosomes was born due to
In phenylketonuria