Theories for Population Change

What is the main difference between Lamarck's and Darwin's theories of evolution?

• Lamarck believed in inheritance of acquired characteristics, while Darwin believed in natural selection.

• Lamarck believed in natural selection, while Darwin believed in inheritance of acquired characteristics.

• Lamarck focused on genetic mutations, while Darwin focused on environmental changes.

• Lamarck and Darwin had identical theories.

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Analyzing

Explain how Darwin's theory of natural selection accounts for the long necks of giraffes.

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Applying

According to Lamarck, if an organism does not use a body part, it will eventually _______.

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Applying

In Darwin's theory, what happens to individuals in a population that are not well adapted to their environment?

• They die off and do not reproduce as often.

• They adapt by acquiring new traits during their lifetime.

• They pass on their traits to their offspring regardless of adaptation.

• They become the dominant members of the population.

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Applying

Which theory better explains the changes in junco, rat, and hawkbeard populations—Lamarck’s or Darwin’s?