AnswersCO-Biology B-CRUnit Test

Unit Test — Unit test Answers

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Henry was studying two populations of the same species of lizards. One population lived on an island and the other lived on the mainland. Both populations were affected by a hurricane that hit the island and the mainland with equal force. A year later, Henry was testing the gene frequency and saw a decrease in genetic variation in the island species, but not in the mainland species. Which best describes a conclusion he might have reached?

A
Gene flow greatly affects small populations, but large populations can recover.
B
Genetic drift greatly affects small populations, but large populations can recover.
C
Gene flow greatly affects large populations, but small populations can recover.
D
Genetic drift greatly affects large populations, but small populations can recover.
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Which best describes biogeographic isolation?

A
It always leads to the formation of new species.
B
It cannot lead to evolution.
C
It is a mechanism for evolution.
D
It occurs only through geographic forces.
23

Which best describes the fossil record?

A
The fossil record cannot provide evidence of evolution.
B
The fossil record provides evidence of a common ancestor to many species.
C
The fossil record provides evidence that disputes the theory of evolution.
D
The fossil record is inaccurate because scientists are not able to date fossils.
24

Thylacosmilus is a marsupial, and Smilodon is a mammal. Thylacosmilus and Smilodon both have saber teeth, but they do not share an ancestor that had saber teeth. What are saber teeth for these organisms?

A
analogous structures
B
homologous structures
C
vestigial structures
D
mutated structures
25

Which best describes the relationship between evolution and natural selection?

A
Natural selection leads to evolution.
B
Evolution leads to natural selection.
C
Natural selection is the same as evolution.
D
Evolution and natural selection are not related.

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