Phys A L7

Phys A L7 - 10/24/2007 Physical Anthropology: Lecture 7...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
10/24/2007 Physical Anthropology: Lecture 7 (Chapter 3) I. Speciation and Phylogeny A. Microevolution refers to how population change under the influence of natural selection and other forces (below the species level) 1. Mutation, natural selection, and genetic drift are mechanisms of microevolution 2. After morphology, physiology and behavior of species in particular environments 3. BUT this isn’t the ONLY process of evolution B. Macroevolution refers to how new species and higher taxa are created C. Organisms cluster into distinct types called species 1. Species usually distinguished by morphology and behavior a) IE: Chimpanzees vs. Gorillas 2. Real biological categories not just abstractions 3. Although everyone agrees that species exist, not everyone agrees on how they should be defined II. Biological Species Concept A. Species: group of interbreeding organisms that are reproductively isolated from other organisms 1. Reproductive isolation: Members of a given group of organisms don’t mate successfully with organisms outside the group 2. Biospecies concepts defines a species in terms of ability to interbreed—
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/08/2008 for the course ANTH 5 taught by Professor Gaulin during the Fall '07 term at UCSB.

Page1 / 2

Phys A L7 - 10/24/2007 Physical Anthropology: Lecture 7...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online