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Major histocompatibility complex and mate choice in sand lizards

Mats Olsson1, Thomas Madsen, Jessica Nordby

  • 1Department of Zoology, The University of Göteborg, Division of Animal Ecology, Box 463, SE 413 90 Göteborg, Sweden. mats.olsson@zool.gu.se

Proceedings. Biological Sciences
|December 12, 2003
PubMed

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Natural Selection and Mating Preferences

The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
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Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
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