Question

Which of the following creates a selection pressure for or against a trait?

• A. Environment
• B. Genetic drift
• C. Mutation
• D. Evolution

Answer 1

Answer: (A)

Environment

Organisms live in the environment. Therefore, any change in the environment requires organisms to adapt themselves. Those that adapt, that is contain the favorable trait survive and reproduce while the those which do not perish. This is how environment creates a selection pressure for or against a trait.

Example: Biston betularia, before and after industrial revolution