LIFESCI 2D03 Chapter Notes - Chapter 11: Sensory System, Motility, Scytodes
11 Jan 2017
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Sexual selection favours characteristics that enhance reproductive success. Primary sexual characteristics: the genitalia and organs of reproduction. Secondary sexual characteristics: morphological differences between the sexes that are not directly involved in reproduction. Differences in behaviour can occur as well (e. g. courtship rituals or vocalizations) Darwin was confused by secondary sexual characteristics because they are energetically costly to produce and may attract predators, but then he realized that they may be advantageous for reproduction rather than survival. Sexual selection: a form of natural selection that acts on heritable traits that affect reproduction. According to darwin, represents the advantage certain individuals have over others of the same sex and species solely in respect to reproduction. Mate competition: intrasexual selection in which one sex competes with other membranes of the same sex for access to the other sex for reproduction. Mate choice: intersexual selection by one sex for members of the other sex for reproduction.
