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.

Through which process were moths able to survive?

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:

What do hummingbirds and hawks represent?

Define the term 'Gene Pool'.

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