Genetic Variation and Evolution

What are differences in alleles of genes found within individuals in a population called?

• Genetic variation

• Genetic drift

• Natural selection

• Gene flow

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Natural populations contain much variation.

• True

• False

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What is the term for how an entity changes through time?

• Evolution

• Stagnation

• Replication

• Reduction

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The development of the modern concept of evolution is traced to which scientist?

• Darwin

• Newton

• Einstein

• Mendel

What phrase did Darwin use to describe evolution?

• Descent with modification

• Survival of the fittest

• Natural selection only

• Inheritance of acquired traits

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According to Charles Darwin, what happens to species over time?

• They remain the same

• They accumulate differences and new species arise from existing ones

• They disappear completely

• They become identical to their ancestors

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Fill in the blank: The quote, "Through time, species accumulate differences; as a result, descendants differ from their ancestors. In this way, new species arise from existing ones," is attributed to _________.

• Charles Darwin

• Gregor Mendel

• Jean-Baptiste Lamarck

• Alfred Russel Wallace

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Darwin was not the first to propose a theory of evolution.

• True

• False

Unlike his predecessors, what did Darwin propose as the mechanism of evolution?

• Genetic drift

• Natural selection

• Mutation

• Migration

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Natural selection can lead to change in ________ frequencies – frequencies of alleles of a gene from generation to generation.

• allele

• protein

• chromosome

• enzyme

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