Natural Selection

An organism with favorable traits reproduces more successfully.

• Fitness

• Natural Selection

• Evolution

• Adaptation

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A change in a species' traits over several generations, driven by natural selection.

• Fitness

• Natural Selection

• Evolution

• Adaptation

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The accumulation of advantageous changes over generations.

• Fitness

• Natural Selection

• Evolution

• Adaptation

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increase an organism’s fitness, making it more likely to reproduce and pass on its favorable traits.

• Neutral Change Mutation

• Positive Change Mutation

• Negative Change Mutation

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Decreases an organism’s fitness

• Neutral Change Mutation

• Positive Change Mutation

• Negative Change Mutation

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no impact on fitness

• Neutral Change Mutation

• Positive Change Mutation

• Negative Change Mutation

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One extreme is favored. One phenotype (what is observed) is favored. It can be subtle or dramatic.

• Diversifying/Disruptive Selection

• Stabilizing Selection

• Directional Selection

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Intermediate is favored, not one of the extremes.

• Diversifying/Disruptive Selection

• Stabilizing Selection

• Directional Selection

Both extremes are favored simultaneously (at the same time).

• Diversifying/Disruptive Selection

• Stabilizing Selection

• Directional Selection

1. rock pocket mouse is an example of

• Diversifying/Disruptive Selection

• Stabilizing Selection

• Directional Selection

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