Unit 7: Evolution

What word describes an inherited trait that helps an organism survive in its environment?

• natural selection

• mutation

• camouflage

• adaptation

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Why do frogs and other organisms reproduce so many eggs or offspring?

• so that their babies can have friends to play with

• the more offspring the more likely it is that some of the offspring will survive

• the more offspring the less likely it is that some of the offspring will survive

• the more offspring the less competition

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Two organisms that are closely related would have:

• completely different DNA sequences
• exactly the same DNA sequence
• no proteins in common
• very similar DNA sequences

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Scientists think that dolphins and whales may have evolved from a common ancestor.  What evidence supports this hypothesis?

• They swim the same way.
• They live in the same area of the ocean.
• They have similar anatomies.
• They eat the same food.

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A structure that seems to serve no purpose in an organism is called:

• dichotomous
• vestigal
• homologous
• fossilized

A characteristic that can be passed on from parent to offspring through genes is called a:

• resistance.
• genetic change.
• trait.
• selective breeding.

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Structures with the same parts but have different functions and suggests that organisms share a common ancestry are:

• vestigial structures.
• homologous structures.
• fossils.
• adaptive radiation.

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Which evidence of common ancestry is being studied in this visual?

• biogeography
• fossil record
• anatomical homology

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The similarities among early stages of the embryos provide evidence that -

• these organisms evolved from a common ancestor
• the organisms all retained their gills and tails
• the organisms belong to the same species

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What conclusions can be made based on this table shown?

• the American black bear and the giant panda are most closely related
• the giant panda and the red panda are most closely related
• the red panda and the racoon are the most closely related

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