L19 - Genes in Populations Hardy-Weinberg

L19 - Genes in Populations Hardy-Weinberg - Chapter 23....

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 23. Genes in Populations I. Microevolution Modeling a population that does not evolve A. Hardy-Weinberg Equation, H-W Theorem, H-W Equilibrium B. Some rules of probability C. Mathematical use of the H-W equation 1
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 The Modern Synthesis Population genetics is the study of how populations change genetically over time Population genetics integrates Mendelian genetics with the Darwinian theory of evolution by natural selection This modern synthesis focuses on populations as units of evolution
Background image of page 2
Overview: The Smallest Unit of Evolution One misconception is that organisms evolve, in the Darwinian sense, during their lifetimes Natural selection acts on individuals, but only populations evolve Genetic variations in populations contribute to evolution 3
Background image of page 3

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

View Full DocumentRight Arrow Icon
Bent grass growing on an abandoned mine site -- this strain tolerates heavy metals toxic to plants of the same species in the background Fig. 23.12 Microevolution ! 4
Background image of page 4
5 Gene Pools and Allele Frequencies A population is a localized group of individuals capable of interbreeding and producing fertile offspring (and that do so in nature ) Lion + tiger mate in a zoo = a liger; but will not in meet in nature The gene pool is the total aggregate of genes in a population at any one time The gene pool consists of all gene loci in all individuals of the population
Background image of page 5

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

View Full DocumentRight Arrow Icon
MAP AREA CANADA ALASKA Beaufort Sea Porcupine herd range NORTHWEST TERRITORIES Fairbanks Fortymile herd range Whitehorse YUKON One species, two populations of caribou in the Yukon Each population more likely to breed within its own population, but some interbreeding occurs 6
Background image of page 6
7 The Hardy-Weinberg Theorem The Hardy-Weinberg theorem describes a population that is not evolving It states that frequencies of alleles and genotypes in a population’s gene pool remain constant from generation to generation , provided that only Mendelian segregation and recombination of alleles are at work Mendelian inheritance p reserves genetic variation in a population
Background image of page 7

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

View Full DocumentRight Arrow Icon
8 From a parental population with known
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/15/2010 for the course BIO 5c taught by Professor Zhu/cardullo/rao during the Spring '08 term at UC Riverside.

Page1 / 24

L19 - Genes in Populations Hardy-Weinberg - Chapter 23....

This preview shows document pages 1 - 9. Sign up to view the full document.

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