Natural Selection Review

What must FIRST exist in a population in order for natural selection to occur?

• variation

• change in environment

• identical genes

• competition

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______ adapt to their environment.

• Individuals

• Species

• Organisms

• Mutations

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Natural Selection is BEST described as

• Ability to generate new traits that better suit the species

• Organisms choose traits that are best suited for them

• The increase of advantageous traits in a population based on the environment

• Causing the death of a large portion of the population

If weather in normally warm ecosystems changes to become cold, what change might occur?

• Cold weather would cause mutations to make organisms adapt

• IF a mutation occurred for thicker fur, it will be passed on

• Evolution would occur resulting in extinction

• Nothing would change

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This is an example of Natural Selection: "Fruit flies with an enzyme that can digest pesticides designed to kill them will increase in numbers."

• True

• False

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This is an example of Natural Selection: "A plant without thorns grows thorns to deter predators"

• True

• False

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Variation is...

• a trait that provides an advantage

• differences in physical or behavioral traits in a population

• small changes in populations that add up to big differences

• mistake in copying genes

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The organisms with the most favorable traits in a population..

• are least likely to survive

• will not pass on their traits to the future generations

• have the smallest chance of reproducing

• have adaptations to help them survive

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A species would most likely go extinct if:

• food becomes more plentiful

• members of the species have adaptations to enhance survival

• the environment changes drastically and no one can adapt

• there is more competition for resources

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Look at the Image below. How might the population change over time if they lived in a green field?

• Brown grasshoppers will increase in numbers

• Green grasshoppers will increase in numbers

• Both will compete for resources and make each other go extinct

• Can't be determined from this information

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