BIOL 409 Lecture Notes - Lecture 7: Limiting Factor, Assortative Mating, Hangingfly
Document Summary
Faster evolution (red queen effect: combining beneficial mutations, without recombination, beneficial mutations compete and are sequentially fixed in a population, with sex, beneficial mutations can be combined and are brought together faster, clearance of deleterious alleles (muller"s ratchet): Members of the low investment sex (often males) are subject to strong sexual selection and will compete for mates. Infanticide: males kill offspring of other males so that females become receptive to breeding. Females may gain an immediate increase in fitness by choosing one male over another: ex. male hangingflies catch insects and release pheromones to attract. Runaway selection female mate with male that display the trait that they prefer (selection on trait and preference) Assortative mating occurs female mate with male that display the trait they prefer. Males display the trait that made dad attractive. Females show preference for the same trait that mom preferred. Selection on either preference or display can lead to a correlated response.
