Biology Unit 1: Earth History: Natural Selection & Overview

Charles _____ developed the theory of natural selection based on his observations of living organisms.

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Which phrase best describes natural selection?

• Survival of the smartest

• Traits acquired in life are inherited

• Survival and reproduction of the fittest

• Random survival of organisms

True or False: Organisms can change their traits during their lifetime if they need to.

• True

• False

A trait that helps an organism survive and reproduce is called an ________.

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NGSS.MS-LS4-4

Which of the following is required for natural selection to occur?

• Environmental disasters

• Genetic variation

• Rapid mutation

• Artificial breeding

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True or False: Natural selection acts on phenotypes, not genotypes.

• True

• False

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The process by which populations change over time is called _______.

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Which statement best explains how antibiotic resistance develops in bacteria?

• Bacteria learn to avoid antibiotics

• All bacteria mutate the same way

• Some bacteria survive due to mutations and reproduce

• Antibiotics cause new traits to evolve

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Which best describes a population with high fitness?

• It has high intelligence

• It adapts easily to all environments

• It survives and leaves many offspring

• It mutates frequently

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Traits must be ______ to be passed on through natural selection.

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