The theory of sudden genetic change that applies to species is known as:

Through which process were moths able to survive?

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:

Give scientific reasons: Genetic drift is much more likely to change allele frequencies in a small population rather than a large population.

$A$ scientist who worked on rats cut their tails up to $21$ successive generations,but at last,he found that the tails remained normal. Which scientist's theory is disapproved by this experiment?

According to Hugo de Vries, mutations are ..........