(23) As an example of human imitation of nature's process of sexual selection
, Darwin points out that, just as birds display their colorful plumes in order to attract a member of the opposite sex, women wear such bird plumes in order to ornament themselves and to appear more beautiful to men (Descent 95).
The intricate sounds are part of a complex sexual selection
In 1871 he proposed his theory of Sexual Selection
operating at two levels (1) same sex competition and (2) mate choice.
is a process in which differences in reproductive success are explained by females picking males based on specific traits.
theory helped Darwin explain many traits, especially in males, that otherwise seemed maladaptive.
Hamilton and Zuk (1982) introduced the concept of parasite-mediated sexual selection
using the "good gene" theory, proposing that females preferred males with more pronounced secondary sexual characteristics because they were indicators of physically fit males possessing parasite-resistant genes.
But the new genetic evidence will do nothing to persuade those who believe that our big brains can be explained without resorting to theories of sexual selection
"So, by ensuring greater diversity within individual offspring, this 'sexual selection
' mechanism also maintains extensive variation within populations." Scientist Thorsten Reusch, of the Max Plank Institute for Limnology in Plon, Germany, believes humans use a similar technique.
explains the evolution of exaggerated male sexual ornaments in terms of differential reproductive success of individuals.
The tail does win females, so it evolves because of sexual selection
, but why do females favor such burdens in their mates?
Despite long being the target of music-hall comedians south of the border, red hair could simply be the result of sexual selection
, according to dermatology expert Prof Jonathan Rees.
I examined sexual selection
arising from differential success in forming mating pairs and natural selection due to success in mating with larger, more fecund females.