Saltation stands for

Variations caused by mutation,as proposed by Hugo de Vries,are

According to Darwinism,what is organic evolution?

Given below are two statements.
Statement $I$ - In disruptive natural selection,individuals acquire peripheral character value at both the ends of the distribution curve.
Statement $II$ - Industrial melanism is an example of disruptive selection.
In the light of the above statements,select the correct option given below:

Which of the following phenomena supports Darwin's concept of natural selection in biological evolution?

The chances of a mutant gene spreading in a population increase when it is .......