individuals with alleles for an extreme type are more likely to survive and reproduce

• stabilizing selection

• directional selection

• disruptive selection

• genetic drift

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the selection pressure favors the extreme phenotypes, dividing the population into 2 distinct groups

• directional selection

• stabilizing selection

• geographic selection

• disruptive selection

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Individuals with intermediate traits are more likely to survive and reproduce

• stabilizing selection

• directional selection

• adaptive radiation

• disruptive selection

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Tall kelp have a distinct advantage over shorter kelp in receiving needed sunlight in their ocean environment

• directional selection

• disruptive selection

• stabilizing selection

• sexual selection

• artificial selection

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Aspen trees that are over 25 m tend to blow over in high winds; aspen that are under 15 m don't get enough sun

• directional selection

• stabilizing selection

• disruptive selection

• artificial selection

• sexual selection

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male elk use their antlers and size to compete with each other for the ability to mate with female elk

• directional selection

• stabilizing selection

• disruptive selection

• artificial selection

• sexual selection

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snails with a forward spiral and snails with a backward spiral have an advantage in their environment

• directional selection

• stabilizing selection

• disruptive selection

• artificial selection

• sexual selection

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modern corn plants are the descendants of teosinte, a wild corn plant that has been selectively bred for over 1000 years.

• directional selection

• stabilizing selection

• disruptive selection

• artificial selection

• sexual selection

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On average, human newborns weigh 7.2 pounds.

• directional selection

• stabilizing selection

• disruptive selection

• artificial selection

• sexual selection

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Fish that produce 40,000+ eggs have greater fitness than fish that produce less than this number

• directional selection

• stabilizing selection

• disruptive selection

• artificial selection

• sexual selection

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