A species of plants that adapts to become more tolerant of toxic heavy metals produced as a result of human mining activities is an example of C. directional selection.
- When those with qualities that are on one side of the population's mean survive longer or reproduce more than those on the other, this is known as directional selection.
- It has been repeatedly shown in wild populations using both experimental and observational methods.
- The "heavy lifting" of evolution is done by directional selection, which tends to move the trait mean in the direction of the environmental optimum.
- Increased adaptability of organisms is the result. It is the fundamental mechanism that Charles Darwin himself thought would drive adaptive evolution.
- Two of Darwin's own examples were that faster wolves were better at hunting deer and that larger nectar-producing flowers were better at drawing pollinating insects.
- Both of these suggest directional selection as opposed to other types (or "modes") of selection.
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