5. The only source of entirely new genetic material is A. natural selection. B.

Question

5. The only source of entirely new genetic material is A. natural selection. B. mutation. C. recombination. D. genetic drift. 6. Which of the following is not a key component of natural selection? A. Traits for strength and vitality are favored over other traits. B. Random variation exists for every trait in a population. C. There will always be competition for resources D. Those with advantageous traits will outreproduce others. 7. The founder effect is a specific type of A. gene flow. B. meiosis. C. genetic drift. D. mutation.

Explanation / Answer

5. Mutation is the only source of entirely new genetic material. Mutation is the changes in DNA. It brings much effect and results in evolutionary change.

6. Differences in traits are not linked to the difference in the ability to survive and reproduce. So, option B is not a key component of natural selection.

7. The founder effect is a specific type of genetic drift. It is the loss of genetic variation accompanying a new population from a small number of individuals of a larger population.

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