How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting tralts$?$

Which one is a sex-linked disease

Genetic counsellors can identify heterozygous individuals by

Genetically identical progeny is produced when an individual

One of the following is not the types of blood groups or blood factors

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