Natural Selection and Evolution Lesson 15

What is a population in terms of genetics?

• A group of individuals of the same species

• A common pool of alleles of genes

• A single organism

• A type of fish

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What happens if a mutation is harmful?

• The individual has a decreased chance of surviving

• The individual becomes stronger

• The individual can fly

• The individual becomes invisible

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What is passed to offspring if a mutation is beneficial?

• The mutated allele

• A new species

• A different color

• A new habitat

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What does natural selection do to harmful alleles?

• Increases their frequency

• Reduces their frequency

• Makes them disappear

• Changes their color

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What is the change in allele frequency within a gene pool called?

• Mutation

• Evolution

• Isolation

• Migration

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How do new species most commonly arise?

• Through mutation

• As a result of isolation

• By natural selection

• By migration

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What happens when a lake with one population of guppy dries out?

• The guppies fly away

• The guppies become two isolated populations

• The guppies become one large population

• The guppies disappear

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What causes the two gene pools to become different over time?

• Natural selection

• Migration

• Mutation

• Isolation

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What happens when the environment changes and floods occur?

• The two populations mix

• The populations disappear

• The populations become one

• The populations fly away

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Why do the two populations not interbreed after mixing?

• They are too similar

• They are too different

• They are too small

• They are too large

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