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A peacock spreading his tail, displaying his plumagePeahen. Peafowlis a common name for two bird species of the genus Pavoand one species of the closely related genus Afropavowithin the tribe Pavoniniof the family Phasianidae(the pheasants and their allies). Male peafowl are referred to as peacocks, and female peafowl are referred to as peahens.
The Indian peafowl ( Pavo cristatus ), also known as the common peafowl or blue peafowl, is a peafowl species native to the Indian subcontinent. It has been introduced to many other countries. Male peafowl are referred to as peacocks, and female peafowl are referred to as peahens, although both sexes are often referred to colloquially as a ...
The plumage of the peacock increases its vulnerability to predators because it is a hindrance in flight, and it renders the bird conspicuous in general. [7] Similar examples are manifold, such as in birds of paradise [8] and argus pheasants. [citation needed] Another example of sexual dichromatism is that of nestling blue tits. Males are ...
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 ornamentation by persistent, directional female choice. [ 1][ 2][ 3] An example is the colourful and elaborate peacock plumage compared to the ...
Some genetic conditions that result in a "leucistic" appearance include piebaldism, Waardenburg syndrome, vitiligo, Chédiak–Higashi syndrome, flavism, isabellinism, xanthochromism, axanthism, amelanism, and melanophilin mutations. Pale patches of skin, feathers, or fur (often referred to as "depigmentation") can also result from injury.
The peacock bass and largemouth bass are excellent examples. The two fishes are not related, yet are very similar. Peacock bass are native of South America and is a Cichla. While largemouth bass are native to Southern USA states and is a sunfish. [117] others will surely be described (but see the results based on DNA data [118]).
Sexual selection creates colourful differences between sexes in Goldie's bird-of-paradise.Male above; female below. Painting by John Gerrard Keulemans.. Sexual selection is a mode of natural selection in which members of one biological sex choose mates of the other sex to mate with (intersexual selection), and compete with members of the same sex for access to members of the opposite sex ...
Nonsense mutation. In genetics, a nonsense mutation is a point mutation in a sequence of DNA that results in a nonsense codon, or a premature stop codon in the transcribed mRNA, and leads to a truncated, incomplete, and possibly nonfunctional protein product. [ 1] Nonsense mutations are not always harmful; [ 2] the functional effect of a ...