BIOLOGY 280 Lecture Notes - Lecture 11: Guppy, Sensory System, Reproductive Isolation
17 Oct 2016
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Document Summary
Sensory bias: natural selection on sensory system (male and female, results in pre-existing bias in females for male trait that has not yet arisen (ex. Preference for a certain color or shape, even if it doesn"t exist in the male yet: mutation in male produces rudimentary version of trait (mutation in males that females are predetermined to prefer) Clucia flowers drop in water that guppies really like to eat. Male guppies have orange spots, and females like bigger and brighter orange spots. Turns out these spots are made from the environment not body functions. Experiment: if given circles from different colors, they will choose the orange. (sensory bias = attraction to orange) because nutritious food usually is orange. Higher attraction to color orange = females are attracted to more orange spots. Males chose slightly larger females most of the time, and females with bigger skin folds.
