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AP Biology Unit 7: Natural Selection

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Unit 7: Natural Selection

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Question 1

Disruptive selection is a type of natural selection in which:

A.Both extreme phenotypes are favored over the intermediate.B.The intermediate phenotype is favored.C.Only one extreme phenotype is favored.D.All phenotypes are equally favored.

Question 2

Antibiotic resistance in bacterial populations is best explained by:

A.Bacteria deciding to evolve when exposed to antibiotics.B.Pre-existing variation in resistance, with selection favoring resistant bacteria.C.Lamarckian inheritance of acquired resistance.D.Random luck without any selective pressure.

Question 3

In a Hardy-Weinberg population, the frequency of the recessive phenotype is $0.16$ . What is the frequency of the heterozygous genotype?

0.16

0.36

0.48

0.64

Question 4

If allele frequencies are not changing across generations, the population is in:

A.Genetic drift.B.Hardy-Weinberg equilibrium.C.Speciation.D.Stabilizing selection.

Question 5

Two populations of finches are separated by a mountain range. Over thousands of generations they evolve different beak shapes and can no longer interbreed. This is an example of:

A.Sympatric speciation.B.Allopatric speciation.C.Polyploidy speciation.D.Convergent evolution.

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Question 6

Genetic drift has a stronger effect in:

A.Large populations.B.Small populations.C.Populations with high mutation rates.D.Populations under strong selection.

Question 7

Which of the following is NOT one of Darwin's four conditions for natural selection?

A.Variation among individuals.B.Heritability of traits.C.Differential reproductive success.D.An external designer that selects favorable traits.

Question 8

Which of the following BEST illustrates evidence for common ancestry?

A.Bird wings and bat wings have similar bone structures despite different evolutionary origins.B.Whales, humans, and dogs all share the same set of bones in their forelimbs (homologous structures).C.Eyes evolved independently in vertebrates and cephalopods.D.Sharks and dolphins both have streamlined bodies for swimming.

AP Biology Unit 7: Natural Selection — Free with Answer Explanations | Test Practice Hub