Evolution and Natural Selection

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Definition: variation

Back

Differences in the DNA sequence.

Front

Definition: fitness

Back

Ability to survive and reproduce in a specific environment.

Front

The presence of pelvic bones in the baleen whale is evidence of which of the following?

Back

Whales evolved from four-legged animals.

Front

Definition: natural selection

Back

Organisms with traits well suited to their environment survive and reproduce at a greater rate.

Front

The Asian shore crab invaded parts of the eastern coast of the United States about 15 years ago. The average shell thickness of the blue mussel population has increased. What is the most likely reason for this increase?

Back

Blue mussels with thick shells survive and reproduce more successfully than mussels without thick shells.

Front

Definition: adaptation

Back

A trait that helps an organism survive and reproduce in its environment.

Front

What is the role of mutations in evolution?

Back

Mutations introduce new genetic variations that can be beneficial, neutral, or harmful.

Front

Definition: common ancestor

Back

A species from which two or more different species have evolved.

Front

What is the significance of fossil records in understanding evolution?

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Fossil records provide evidence of how species have changed over time.

Front

Definition: speciation

Back

The process by which new species arise from existing species.