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Trait theory tends to focus on the individual over the situation in which they are in. [10] This focus has relaxed within modern studies allowing for a consideration of the external factors outside of the self. As the focus becomes more relaxed (but still prominent as it is a main part of the theory) research expands.
Anthropologist Peter Frost has proposed that sexual selection for women with unusual hair or eye color was responsible for the evolution of pigmentary traits in European populations, [128] however this theory has since been refuted by data-based evidence from genetics and spectrophotometry, [129] [130] and multiple studies have shown that women ...
European pied flycatcher Ronald Fisher in 1912. 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, [1] states that a female's ideal mate choice among potential mates is one whose genes will produce males with the best chance of reproductive success.
The indicator traits hypothesis is split into three highly related subtopics: the handicap theory of sexual selection, the good genes hypothesis, and the Hamilton–Zuk hypothesis. People rate the importance of certain traits differently when referring to their own or to others' ideal long-term partners.
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 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 ...
Fisher's principle is an evolutionary model that explains why the sex ratio of most species that produce offspring through sexual reproduction is approximately 1:1 between males and females. A. W. F. Edwards has remarked that it is "probably the most celebrated argument in evolutionary biology". [1]
[9] [16] [17] However, the handicap principle gained wider acceptance because it is supported by game theory models, most notably the Scottish biologist Alan Grafen's 1990 signalling game model. [1] This was essentially a rediscovery of the Canadian-American economist Michael Spence 's job market signalling model , [ 18 ] where the job ...
Allport contributed to the trait theory of personality, and is known as a "trait" psychologist. He opposed the idea that people can be classified according to a small number of trait dimensions, arguing that each person is unique and distinguished by particular traits. [ 15 ]