Unit 6 Test

A population of bacteria is treated with hand sanitizer. Because of genetic variation in the population, what is a possible outcome?

• The population will grow quickly.

• All of the bacteria are already resistant.

• They will get better at obtaining a food source.

• Some may be resistant and survive.

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One of the biggest ways that a species evolves is because some organisms with some traits survive and reproduce better than others. This process is known as

• Natural Selection

• Convergent Evolution

• Coevolution

• Sexual Selection

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Genes for traits that help and organism be more successful reproductively can be expected to

• cause it to evolve into a new species

• become more common in the future

• cause the extinction of the species

• eventually be eliminated by natural selection

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An adaptation is

• any trait an organism possesses

• how an organism evolves during its own lifetime

• a gene an organism has

• a trait that helps an organism survive in its environment

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Genetic diversity is ultimately/mainly the result of

• meiosis

• viruses

• mutations

• reproduction

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Which of the following is NOT an example of evolution?

• Horses becoming taller and faster over millions of years

• All species of tortoises in the Galapagos islands descending from a common ancestor

• Human brains becoming larger over time

• A caterpillar going through a change into a butterful

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Which of the following does NOT increase genetic variation?

• Mutations

• Gene flow

• Mitosis

• Crossing over

Which of the following is NOT a principle of natural selection?

• Most species produce more offspring than will actually reproduce

• Organisms compete for limited resources

• Evolution will occur as an organism gets older and learns more

• In every population, adaptations allow some organisms to survive and reproduce better than others

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Individuals that are well adapted to their environment will survive and produce

• fewer mutations

• more offspring

• stronger gene

• better traits

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Natural selection results in change over time by acting on traits that are

• heritable

• new

• mutated

• better

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