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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.
Gender selection, or sex selection, is a fertility procedure used to choose the gender of a baby prior to conception.hen gender selection is used to prevent a genetic disease, the process is called medical gender selection.. In the so-called sex-linked diseases, genetic diseases are inherited via the mother, and only male offspring are affected.