Types of Natural Selection

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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On average, human newborns weigh 7.2 pounds.

• directional selection

• stabilizing selection

• disruptive selection

• artificial selection

• sexual selection

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Labradoodles and cockapoos are different varieties of domestic dogs that can be purchased from dog breeders.

• directional selection

• stabilizing selection

• disruptive selection

• artificial selection

• sexual selection

Bacteria that are too large cannot obtain nutrients efficiently and bacteria that are too small cannot compete for those nutrients successfully

• directional selection

• stabilizing selection

• disruptive selection

• artificial selection

• sexual selection

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Producing 1000 cactus spines requires too much energy, but producing <500 leaves the plant open to predation

• directional selection

• stabilizing selection

• disruptive selection

• artificial selection

• sexual selection

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