Blood bank of the body or reservoir where the blood is stored and can be mobilized, is

In a gene pool, along with beneficial mutations those mutations also exists which are damaging to an individual. It has been found that these mutations are irreversible because

$I.$ they have survival value

$II.$ they are acquired

$III.$ they are recessive and carried by heterozygous individuals only

$IV.$ they show genetic drift

Choose the incorrect option for given statement

One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of ${F_2}$ progenies that mutation is found in

Mongolism syndrome is caused by

An albino lady marries a normal man having one gene for albinism. They have $3$ daughters and $1$ son. The son will be

Which one of the following mutation partially or fully reverses the harmful effects of previous mutation