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Example of Runaway Selection. Theory of random sexual selection of mates. Used to explain passing on of useless or 'expensive' genes which may create liabilities. It's called 'runaway' selection because the gene traits carried on may become liabilities if carried to extremes. The genes may in fact exaggerate physical characteristics which makes the animal less able to survive, rather than more so, in normal evolutionary theory.
Updated April 12, 2017. Directional selection is a type of natural selection that favors one extreme phenotype over the mean or another extreme. This phenomenon is usually seen in environments that have changed over time. Changes in weather, climate, or food availability lead to directional selection.