If gene migration happens multiple times,it would lead to

Allopatric speciation is due to

Single step,large mutation is known as saltation. This statement is given 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:

Which of the following concepts is attributed to Charles Darwin?

According to Darwin,organic evolution is due to: