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Exam 11: An Evolving Enemy: Natural Selection

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As natural selection acts on a trait in a population, the amount of variation associated with that trait in the population is likely to do which of the following?

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Question 1
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Which of the following would exert selection pressure on a population of insects?

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It is most likely that dinosaur populations became extinct because

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The raw material for evolution is ________.

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Question 4

Which of the following plants is the most fit?

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Question 5

Which of the following is NOT part of the theory of natural selection?

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Question 6

What kind of bacterial variant would be most likely to survive in the human digestive system?

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Question 7

You notice that some squirrels in your neighborhood have a much darker coat color than most of the other squirrels. Is this darker color an adaptation?

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Question 8

When a population of organisms is evolving, what can you be sure is happening?

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Question 9

Natural selection is only one of several possible causes of evolution.

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Question 10

Any trait that is controlled by genes can be acted on by natural selection.

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Question 11

Once an adaptation appears, it remains in all the descendants unless the species becomes extinct.

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Question 12

What is an allele?

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Question 13

Human females have a lifespan of over 80 years. However, the trait of living for eight decades is somewhat of a puzzle to evolutionary biologists. Why might that be?

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Question 14

A primary source for new, unique genes in a population is

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Question 15

Drug resistance to anti-HIV drugs is a serious problem. Which of the following facts about HIV is the most direct reason why drug resistance appears so rapidly?

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Question 16

Traits that increase fitness in a particular environment are called ________.

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Question 17

Which of the following is an adaptation?

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Question 18

Which of the following is the main reason widespread resistance to tuberculosis (TB)is not likely to evolve any time soon?

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Question 19

Why haven't humans evolved a resistance to the common cold?

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Question 20
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