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Charles Darwin's second book of theory involved many questions of Darwin's time. It was Darwin's second book on evolutionary theory, following his 1859 work, On the Origin of Species, in which he explored the concept of natural selection and which had been met with a firestorm of controversy in reaction to Darwin's theory. A single line in this ...
"Shady Grove" (Roud 4456) [1] is a traditional Appalachian folk song, [2] believed to have originated in eastern Kentucky around the beginning the 20th century. [3] The song was popular among old-time musicians of the Cumberlands before being widely adopted in the bluegrass repertoire. [ 4 ]
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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 mechanism of evolution in which members of one 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 (intrasexual ...
World map of birth sex ratios, 2012 The one child policy in China has contributed to the imbalanced sex ratios. Image shows a community bulletin board in Nonguang Village, Sichuan province, China, keeping track of the town's female population, listing recent births by name and noting that several thousand yuan of fines for unauthorized births remain unpaid from the previous year.
Fecundity selection, also known as fertility selection, is the fitness advantage resulting from selection on traits that increases the number of offspring (i.e. fecundity). [1] Charles Darwin formulated the theory of fecundity selection between 1871 and 1874 to explain the widespread evolution of female-biased sexual size dimorphism (SSD ...
When told about prenatal sex selection techniques such as sperm sorting and in-vitro-fertilization embryo selection, 40% of Americans surveyed thought that picking embryos by sex was an acceptable manifestation of reproductive rights. [120] These selection techniques are available at about half of American fertility clinics, as of 2006. [121]
It has been suggested that sexual selection played a part in the evolution of the anatomically modern human brain, i.e. the structures responsible for social intelligence underwent positive selection as a sexual ornamentation to be used in courtship rather than for survival itself, [4] and that it has developed in ways outlined by Ronald Fisher ...