Question

Which of the following is/are true of BOTH natural selection and genetic drift?

I. Promotes traits that increase survival or reproduction

II. Depends on genetic mutations as the source of variation

III. Can lead to evolutionary change

Question 5 options:

	I and III
	I only
	I, II, and III
	II and III
	I and II

Answer 1

Answer 5 : “II and III”

Natural selection is the ultimate cause of evolution; whenever there is a change in the environment of a population the alleles which are having favorable variation will survive and will increase in number. The varieties or the changes in the genetic makeup of the population take place because of random mutation.

Genetic drift is the change in the allele frequencies of the population because of some random events. Besides drastic changes in the natural environment, rate of mutation in a particular population can lead to change in the allele frequencies of the population which can be favored by natural selection and will lead to evolution.

Hence both the statements mentioned below are true for natural selection and genetic drift

II. Depends on genetic mutations as the source of variation

III. Can lead to evolutionary change