ANT101 - Lecture 5

Monday January 21, 2013

Chapter 4: Modern Human Variation & Adaptation

I. Modern Theory of Evolution (Definitions p. 60-61)

A. Modern Synthesis

I. Variation in a Population

a. Produced by Mutation

i. Least common source of variation, but the only way you can get new traits

b. Mixed, Distributed by Recombination & Sexual Reproduction

i. This is how you get different combinations

c. Redistribution by Gene Flow, Genetic Drift (p. 62-63)*

II. Natural Selection

a. Reproductive Fitness

i. Genetic differences result in higher reproductive fitness in some individuals due to differential reproduction and sexual selection

ii. Variation is ALREADY in a population, it doesn't arise when it's needed (contrary to Lamarck)*

In general, you need BOTH for evolution to happen

B....