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Mate Choice And Species Recognition Amongst D. Simulans

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Mate Choice and Species Recognition amongst D. simulans and D. mauritiana

Brittany Wordekemper

February 23, 2016
Ecology and Evolution Lab
Emily Hudson

Abstract

Sexual selection is a kind of natural selection that happened to come about through a specific preference by one sex for definite characteristics in individuals of the opposite sex. When it comes to choosing a mate, mate choice is very important for individuals to avoid mating with the wrong species but it also operates within a species as well. The species used for this experiment were D. simulans and D. mauritiana, two species which are very closely related to D. melanogaster. D. simulans and D. mauritiana are also closely related and tend
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Therefore, mate choice is extremely important for individuals to avoid mating with the wrong species but it also operates within a species as well. This tendency to avoid heterospecific mates is called behavioral isolation. Mate choice can be important in the evolutionary process, speciation, in which populations of conspecific diverge into separate species (Ecology and Evolution Behavior Lab Packet). It is extremely beneficial, mostly to females, to be choosy. Being choosy is a major element of sexual selection because by choosing the male with the most desirable traits, the offspring of the female end up benefiting due to receiving the best genes possible. Species that are very closely related are more likely to evolve resilient species discrimination due to the emphasis of preferences amongst mates. The cost of fitness of heterospecific matings have been thought to be higher in the females than in the males. The reason being that the females are investing more resources into the offspring where as the males are not, so if the females happen to mate with the wrong species and all of the offspring die or become sterile, this ends up being a huge waste of resources for females as opposed to males who would not being losing out on much at all. A consequence of the higher cost of fitness for heterospecific matings would be that females are more likely to show stronger species
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