Runaway selection was first proposed by R. A. Fisher, an English statistician in the 1930s. He believed the runaway selection accounted for the rapid evolution of specific physical traits in male animals of certain species. Some traits are so strongly preferred by certain females that they may mate only with males that possess the traits they want. In subsequent generations, the males usually possess the same traits and the females have the same affinity for the trait. Over time, the species may be characterized by extreme sexual dimorphism.
Organisms develop extreme traits that are used for mate selection that pose a threat to themselves as it makes them more noticeable to predators. Such as the stalk-eyed fly and the tungara frog.
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