In which of the following scenarios would evolution by natural selection cease to occur?
A) Humans become extinct because of a disease epidemic.
B) A thermonuclear war killed most living organisms and changed the environment drastically.
C) Genetic recombination and mutation stopped, and organisms could reproduce only asexually.
D) Ozone depletion led to increased ultraviolet radiation, which caused many new mutations.

Question

Quizplus · Accepted Answer

Natural selection requires genetic variation to act upon, which is generated through genetic recombination and mutation. If these processes stopped, evolution by natural selection would cease because there would be no new variations for natural selection to act upon.

In Which of the Following Scenarios Would Evolution by Natural