Class Notes (835,600)
Canada (509,275)
York University (35,236)
Biology (2,238)
BIOL 1602 (40)

sexual selection

2 Pages
Unlock Document

BIOL 1602
Rebecca Jubis

 Natural selection is a potent force for divergence Sexual Selection  Sexual selection acts on characters involved in mate choice. Changes in sexual selection can cause reproductive isolation and trigger rapid divergence  Sexual selection is a form of natural selection that results from differences among individuals in their ability to obtain mates  It has been shown that changes in the way that a population of sexual organisms chooses or acquires mates can lead to rapid differentiation from the ancestral populations  The key point is that sexual selection promotes divergence efficiently because it affects gene flow directly 16.4- Secondary Contact  Suppose a particular speciation event begins with the geographic isolation of two populations and a corresponding reduction in gene flow, and then continues as selection, mutation, and drift cause genetic divergence between the two groups Reinforcement  If populations have diverged during a period when the groups lived in different geographic areas, then any hybrid offspring that are produced should have markedly reduced fitness relative to individuals in each of the parental populations o Basically if natural selection, genetic drift and adaptation worked against heterozygous offsprings, then hybrid offsprings would have decreased fitness  Due to this, there should be strong natural selection in favour of assortative mating- meaning that selection should favour individuals that choose mates only from the same population  Selection that reduces the frequency of hybrids in
More Less

Related notes for BIOL 1602

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.