Speciation and Extinction

When has speciation occurred?

• When populations no longer look the same

• When populations no longer have the same frequency of alleles

• When populations are living in different environments

• When populations can no longer successfully breed in nature

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The disappearance of a species refers to

• Evolution

• Extinction

• Migration

• Mutation

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When a population becomes divided by an event such as a new river forming, ____________ has occurred.

• Differentiation 

• Isolation

• Adaptation

• Separation

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According to most scientists, what is the ultimate cause of most mass extinctions?

• overhunting

• evolution of new species to replace old ones

• major change in environment

• asteroid impact

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Which of these describes a species that has become extinct?

• fewer members of the species are dying than being born

• more members of the species are dying than being born

• very few members of a species are alive

• all members of a species have died

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True or False? Many scientists think that an asteroid caused the dinosaurs to go extinct.

• True

• False

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When a plant or animal becomes extinct, it is gone _______.

• forever

• from one particular area

• for 5 years

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What is speciation?

• The process by which new species arise

• The extinction of a species

• The migration of species to new areas

• The adaptation of species to their environment

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Which of the following is a mechanism of speciation?

• Genetic drift

• Natural selection

• Geographic isolation

• All of the above

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What is the primary cause of extinction in modern times?

• Habitat destruction

• Natural disasters

• Genetic mutations

• Overpopulation

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