Sexy son hypothesis
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The sexy son hypothesis in evolutionary biology and sexual selection, proposed by Patrick J. Weatherhead and Raleigh J. Robertson of Queen's University in Kingston, Ontario in 1979, states that a fema
European pied flycatcher (Ficedula hypoleuca)
Ronald Fisher in 1912
Guianan cock-of-the-rock (Rupicola rupicola)
The successful sperm is the one that fuses with the egg.
Fisherian runaway
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Fisherian runaway or runaway selection is a sexual selection mechanism proposed by the mathematical biologist Ronald Fisher in the early 20th century, to account for the evolution of ostentatious male
Sexy son hypothesis
…coupling that will drive self-reinforcing coevolution of both trait and preference, due to the mating advantage of males with the trait, creating a Fisherian runaway sexy sons process. Similar models have been proposed for postcopulatory female preferences, such as the time at which females removed the male's sperm…
The peacock tail in flight, the classic example of an ornament assumed to be a Fisherian runaway
Female (left) and male (right) pheasant, a sexually dimorphic species
Peacock spider males perform courtship dances that display their boldly patterned chelicerae, legs, and abdomens. Females are cryptic brown.
The peacock, on the right, is courting the peahen, on the left.