BIOL 1F90 Lecture 11: BIOL 1F90 lecture 11 winter 2016
25 Feb 2016
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Document Summary
Hbas: sickle cell trait, partially protected from malaria. Two or more alleles are kept in balance, and therefore are maintained in a population over the course of many generations. Directed at certain traits of sexually reproducing species that make it more likely for individuals to nd or choose a mate and/or engage in successful mating. In many species, a ects male characteristics more intensely than it does female. Horns in male sheep, antlers of moose, male ddler crabs enlarged claws. Males directly compete for mating opportunities or territories. Genital tract or egg selects against genetically related sperm. Also explains traits that decrease survival but increase reproductive success. Male guppy (poecilia reticulata) is brightly coloured compared to the female. In places with few predators, the males tend to be brightly coloured. In places where predators are abundant, brightly coloured males are less plentiful because they are subject to predation.
