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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.
DEFINITION of 'Adverse Selection'. 1. The tendency of those in dangerous jobs or high risk lifestyles to get life insurance. 2. A situation where sellers have information that buyers don't (or vice versa) about some aspect of product quality.