KE REVIEW~ UNIT 7

A mutation occurs in the genes that code for coat color in deer. Which change will most likely result from this mutation?

• a change in the selection pressures acting on coat color

• a change in the coat-color genes of deer predator species

• an increase in coat-color diversity in the population

• an increase in the number of genes for coat color in the population

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In North America, the eastern spotted skunk mates in late winter, and the western spotted skunk mates in late summer. Even though their geographic ranges overlap, the species do not mate with each other. What most likely prevents these two species from interbreeding?

• habitat isolation

• gametic isolation

• geographic isolation

• reproductive isolation

The diagram shows the forelimbs of three animals. Which statement best describes the bones in the animals?

• All organisms on Earth have the same bones.

• Different bones in similar species serve the same function.

• The species that are the most evolved have the longest bones.

• Similar bones in different organisms may have different functions.

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The graph represents the number of light brown and dark brown organisms living on the bottom of a clear, sandy lake 20 years ago. Over time, the lake bottom has become covered with dark sand and sediment. Which change has most likely occurred in the population?

• The number of light-brown individuals increased.

• The number of dark-brown individuals increased.

• The number of light-brown and dark-brown individuals increased.

• The number of light-brown and dark-brown individuals became equal.

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The frequency of an allele in a fl y population changes from 89% to 20% after three generations. Which other events most likely occurred during the same time period?

• an environmental change and a fly population increase

• an environmental change and a fly population decrease

• interbreeding of flies with an invasive species and fly population speciation

• interbreeding of flies with an established local species and fly population speciation

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A teacher lists four statements for students to interpret. Which table of information correctly distinguishes between the statements?

• 
• 
• 
• 

A researcher observes two species of frogs in the same area. Both species have a similar diet. One species breeds in fast-moving streams, while the other species breeds in ponds. Both species are similar in appearance and have very similar DNA. Which information provides the best evidence that these two species descended from a common ancestor?

• the species’ similar diets

• the species’ shared habitat

• the species’ mating behaviors

• the species’ physical characteristics

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A population of squirrels was separated during the formation of the Grand Canyon. Over time the squirrels, separated by the canyon walls and the Colorado River, became unique species. Which mechanism most likely caused the development of the new species?

• habitat preference

• increased gene flow

• geographic isolation

• behavioral isolation

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Which statement is a hypothesis?

• The presence of an enzyme increased the reaction rate.

• The reaction rate increased 100% once the enzyme was introduced.

• Introducing an enzyme into a reaction did not increase the rate of the reaction.

• When an enzyme is introduced into a reaction the reaction rate will increase by 100%.

Which condition would most likely result in an increase in the phenotypic variation within a population?

• The variety of food available in the habitat decreases.

• A mutation leads to individuals with genetic differences.

• Competition is reduced for all individuals during the winter.

• Climate remains unchanged in the population’s ecosystem.

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