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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.
Genetic drift is the random change in the frequency of alleles within a population's gene pool. It can cause the genetic composition of a population to change in one direction or another.nother Answer : Genetic drift is where random chance events which can effect the gene's abundance in a population, regardless of whether the gene is advantageous or not. For example, a natural disaster kills animals indiscriminately, regardless of their genetic makeup. A random change in allele frequencies over time.