Down's syndrome occurs in the ........... pair of chromosome by increasing a chromosome.
$22^{th}$
$21^{th}$
$7^{th}$
$23^{rd}$
In order to determine whether variations of a character in a population were genetically controlled, the most appropriate procedure will be to
Select the incorrect statemant from the following.
Linkage was first suggested by
A hereditary disease which is never passed on from father to son is
Meta-females have