$MN$ factors are due to

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

Study of improvement of human race by providing ideal nature is

A tobacco plant which is heterozygous for albinism $(a\, recessive\,character)$ is self pollinated if $1200$ seeds are subsequently germinated, how many of the seedlings would have the parental genotype

How many nucleosomes are found in helical coil of $30\ nm$ chromatin fibre