Whenever appreciable differences exist in a species … there will be a tendency to select also those individuals of the opposite sex which most clearly discriminate the difference to be observed, and which most decidedly prefer the more advantageous type. Sexual preference originated in this way may or may not confer any direct advantage upon the individuals selected, and so hasten the effect of the Natural Selection in progress. Charles Darwin published a book on sexual selection in called The Descent of Man, and Selection in Relation to Sex ,  which garnered interest upon its release but by the s the ideas had been deemed too controversial and were largely neglected. Subsequently, if strong enough, female preference for exaggerated ornamentation in mate selection could be enough to undermine natural selection even when the ornament has become non-adaptive. Fisherian runaway has been difficult to demonstrate empirically, because it has been difficult to detect both an underlying genetic mechanism and a process by which it is initiated. From Wikipedia, the free encyclopedia.
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