Question

Genetic variation _____. a. must be present in a population b. before natural selection can act upon the population c. arises in response to changes in the environment d. is created by the direct action of natural selection

Answer 1

Answer:

B.

Explanation:

This is the change in the amino acid sequence of DNA of an organism.

It is one of mechanisms of  Natural selection. Variation  makes some organism to develop selective advantages over others in the same population. Therefore they have resistance to selection pressure and more natural selected   above  others organisms in the same population