In natural selection,more individuals acquire value other than the mean character value,which indicates . . . . . . .

Sewall Wright effect is . . . . . . .

What are the key concepts in the evolution theory of Darwin?

Given below are two statements regarding evolution.
$Statement-I$: Selection against harmful mutation leads to a mutation balance.
$Statement-II$: In mutation balance, the allele frequency of harmful recessives keep on changing generation after generation.
In the light of above statements, choose the most appropriate answer from the options given below:

When is genetic drift operative?

$A$ very important consequence of geographical isolation is ........