According to Hugo de Vries,the mechanism of evolution is

Select the appropriate option for the given figure.

In a population of plants,some were extremely tall,and the remaining were extremely dwarf. No plants of the population showed intermediate height. The type of operation of natural selection in the above case is

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:

In the case of the peppered moth $(Biston \text{ } betularia)$, the dark-colored form became more prevalent than the light-colored form in England during the Industrial Revolution. This is an example of:

Genetic drift operates in