The presence of deleterious alleles in a heterozygous genotype in a population is called......

Organisms that possess favorable variations are considered to be:

"Migration may enhance or blur the effects of selection". Comment.

The concept that "Population tends to increase geometrically while food supply increases arithmetically" was put forward by:

Given below are two statements.
Statement-$I$: Elimination of particular alleles from a population due to natural disasters is called genetic drift.
Statement-$II$: Sudden temporary heritable change in the gene is called point mutation.
In the light of above statements,choose the most appropriate answer from the options given below:

To be evolutionarily successful,a mutation must occur in the