Ch 15 & 16 Evolution and Population Genetics

The separation of populations by barriers such as rivers, mountains, or bodies of water is called

• temporal isolation
• geographic isolation
• behavioral isolation
• genetic equilibrium

The number of individuals with a particular phenotype divided by the total number of individuals in the population is the

• genotype frequency
• phenotype frequency
• allele frequency
• Hardy-Weinberg equilibrium

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The large, brightly colored tail feathers of the male peacock are valuable to him because

• they attract potential predators
• they warn off potential competitors for mates
• they attract potential mates
• they attract people who provide them with food

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Species 1 and 2 have very different genes. Species 7 and 8 have only a few different genes. What is most likely true about these species?

• Species 1 and 2 are more closely related to each other than species 7 and 8 are to each other
• Species 1 is the ancestor of species 7 and species 2 is the ancestor of species 8
• Species 7 and 8 are more closely related to each other than species 1 and 2 are to each other
• All four of these species are probably equally related to each other

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When a dairy farmer chooses to breed the cows that give the most milk in the herd, the farmers are following the principle of

• acquired characteristics
• artificial selection
• natural selection
• descent with modification

Reproductive isolation differs from geographic isolation in that

• reproductive isolation only occurs after fertilization, whereas geographic isolation occurs before fertilization
• geographic isolation never leads to speciation, whereas reproductive isolation sometimes does
• members of two species in which reproductive isolation occurs never try to interbreed, whereas geographically isolated ones do
• members of the same species are not physically separated in reproductive isolation, whereas they are separated in geographic isolation

Which of the following statements defines the members of a species?

• They are temporally isolated from each other
• They have identical genes
• They mate and produce offspring
• They are geographically isolated from each other

Which of the following are examples of fossils?

• shells or old bones
• any traces of dead organisms
• insects trapped in tree sap
• All of the above

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When there are only a few surviving individuals of a species, the species is vulnerable to extinction because there is little if any _______ on which natural selection can act

• genetic variation
• immigration
• emigration
• geographic isolation

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If two populations have been reproductively isolated and can no longer breed and produce fertile offspring, the process of ______ has occurred

• speciation
• alternation
• immigration
• emigration

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