$A$: $A$ single large mutation called saltation can produce new species.
$R$: Mutations are directional.

Which of the following is a result of geographical isolation?

Select the appropriate option for the founder effect.

Hybrid breakdown refers to the condition where the $F_2$ generation or subsequent generations of a hybrid cross are physiologically inferior or less viable compared to the $F_1$ generation.

Which of the following natural processes is likely to hasten organic evolution?

Given below are two statements regarding evolution.
$Statement-I$: Isolation is the separation of a population of a particular species into smaller units, which prevents interbreeding between them.
$Statement-II$: Due to isolating mechanisms, divergence and speciation do not occur.
In the light of the above statements, choose the most appropriate answer from the options given below.