Textbook Notes (362,896)
Canada (158,081)
Anthropology (530)
ANTB14H3 (34)
Chapter 4

Chapter 4

2 Pages
Unlock Document

University of Toronto Scarborough
Michael Schillaci

Week 3 Chapter 4: Speciation and Phylogeny Microevolution: how populations change under the influence of natural selection and other evolutionary forces o Natural selection, mutation, genetic drift o Affect morphology, physiology, behaviour of particular species in particular environments Macroevolution: how species and higher taxa are created o Tells how new species, genera, families, higher groupings come into existence Species can usually be distinguished by their behaviour and morphology Most zoologists believe in biological species concept: defines a biological species as a group of organisms that interbreed in mature and are reproductively isolated Reproductive isolation: members of a given group of organisms do not mate successfully with organisms Biological species concept defines a species in terms of ability to interbreed because successful mating leads to gene flow Gene flow: the movement of genetic material within parts of a population or from one population to another o Tends to maintain similarities among members of same species Reproductive isolation prevents species from genetically blending Ecological species concept emphasizes the role of selection in maintaining species boundaries Allopatric speciation: when population divided by some type of barrier and different parts of population adapt to different environments If there is some gene flow after the members of 2 populations initially come back into contact, 2 additional processes may increase degree of reproductive isolation and facilitate the formation of new species o Character displacement: occur if competition over food, mates or other resources increases the morphological differences between the immigrants and the residents
More Less

Related notes for ANTB14H3

Log In


Don't have an account?

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.