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Exam 14: The Origin of Species

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Question 21

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Two populations that have been separated by a river are most likely to become separate species if

A) fur color is different in the two populations.
B) genes controlling ear development become different so that members of one population have much longer ears than the other.
C) genes controlling molecules on the surface of the sperm that bind with egg receptors are different in the two populations.
D) feeding habits are different in the two populations.

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Question 22

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For speciation to occur there must be

A) sexual reproduction.
B) genetic variation.
C) isolation.
D) natural selection.

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Question 23

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In the North Pacific Ocean, two groups of the same species of killer whales (Orcinus orca) appear to be forming two different species based on what they eat. One group eats fish and the other eats mammals such as seals. Scientists can tell what they eat based on their teeth, because whales that feed on fish have significantly different wear patterns. -Which of the following describes the type of speciation event that is occurring in these whales?

The emergence of many diverse species from a common ancestor is called

Which of the following types of reproductive barriers separates a pair of insect species that could interbreed but for the fact that one lives on goldenrod plants and the other on autumn daisies in the same general area?

The Grants' finch research included morphological, geographic, genetic, and ecological data. Which of these could not be directly determined by examining the birds as they tagged them?

If the divergence illustrated here is based on some female insects preferring large males and others preferring small males, then this would be an example of

Speciation has become complete when

These data collected by the Grants show that

Sympatric speciation commonly occurs through ________ in plants but is more likely to occur through ________ in animals.

Which of the following types of reproductive barriers separates a pair of moth species that could interbreed but for the fact that the females' mating pheromones are not attractive to the males of the other species?

Two species interbreed occasionally and produce vigorous, fertile hybrids. When the hybrids breed with each other or with either parent species, however, the offspring are feeble or sterile. These species are affected by

Which of the following statements about the Galápagos finches is false?

The Grants' work on natural selection would have been impossible to complete if the traits they examined were

Which of the following statements regarding the definition of species is false?

In which of the following situations would speciation be most likely to occur?

The ________ suggests that speciation occurs in brief spurts.

Diane Dodd raised different fruit fly populations on different food sources. She found that after about 40 generations the evolution of reproductive isolation was under way. The mechanism of evolution responsible for this was

One of the key contributions of the punctuated equilibrium model is that it helps explain

The geographic isolation of a population from other members of the species and the subsequent evolution of reproductive barriers between it and the parent species describes ________ speciation.