Evolution Unit 6 Review

A rare two-headed turtle is alive and thriving. What caused this genetic variation?

• Environmental factors

• Dietary changes

• Increased sunlight exposure

• A mutation

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There are three types of mutations we learned (beneficial, neutral, and harmful). How do we know a mutation is BENEFICIAL?

• If the organism lives longer

• If the organism grows larger

• If the organism becomes more colorful

• If the organism can survive to have offspring

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Unlike most members of her grey-coated species, the kangaroo on the right has snow-white fur and pink eyes. How did this happen?

• Environmental changes

• Dietary changes

• Increased sunlight exposure

• Changes in the DNA (mutation)

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Populations of organisms undergo changes through mutations or adaptations. For example, a mutation might result in a new color in a flower. What could explain the change in the flower's color?

• It had random changes in its DNA

• It learned to blend with its surroundings

• It changed its cells to have different pigments

• Many flowers passed this trait to offspring.

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What could explain why certain bird populations have long beaks?

• Birds with longer beaks could hide more easily from predators

• Birds with longer beaks were more likely to survive and reproduce

• Birds with longer beaks were closer to water sources

• Birds with longer beaks could fly faster.

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How do adaptations occur in a population?

• They occur randomly.

• Natural selection favors the best traits.

• Environmental changes directly cause them.

• Organisms consciously decide to change.

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Mutations happen at the...

• Cellular level

• Organ level

• Tissue level

• Genetic level

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Look at the data table. Why did the dark moth population decrease?

• They migrated to new areas

• They changed their diet

• They became nocturnal

• Predators can easily see them and eat them

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See the data table. How would you explain the changes of this moth population?

• Migration to new areas

• Changes in diet

• Increased reproduction rates

• Adaptation through natural selection

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The disappearance of all members of a species from Earth is:

• Migration

• Adaptation

• Evolution

• Extinction

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