Unit 8: Evolution/ Natural selection Updated

Evolution is a change in a population (frequency of alleles) over time.

• True
• False

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Who stated that you "aquire" new traits through use and disuse of body parts? Ex.) If a giraffe stretches its neck, then it will become longer.

• Darwin

• Lamark

• Malthus

Who stated the theory of Evolution by Natural Selection?

• Darwin
• Lamark
• Malthus

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What is a theory?

• an educated guess based on observation
• a scientist's ideas
• hypothesis that has been supported and is accepted as true
• act of nature, often with a mathematical formula

______ is the ultimate source of genetic variation. (Hint: Can introduce new traits into a population.)

• Mutation

• Adaptation

• Natural Selection

• Artificial Selection

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Variation means

• simmilarities
• differences
• genes
• adaptations

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__________ is when humans select for a trait.

• Natural Selection

• Selective Breeding/ Artificial Selection

• Genetic Drift

There are 3 different size turtle shells. (Small, medium, and large) What type of selection occurs if only the small survive?

• stabilizing
• disruptive
• directional

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There are 3 different size turtle shells. (Small, medium, and large) What type of selection occurs if only the small and large size turtles survive?

• stabilizing
• directional 
• disruptive

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There are 3 different size turtle shells. (Small, medium, and large) What type of selection occurs if the medium turtles are most fit?

• stabilizing
• directional
• disruptive

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