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Evolution

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by

Ann Heitkemper

on 12 November 2013

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Transcript of Evolution

Microevolution - change in a population
What is a population?
Populations are the units of evolution
Gene Pool = total collection of genes in a population (Remember alleles?)
Macroevolution: Origin of Species
Charles Darwin
Natural Selection

Evolution
Hardy-Weinberg Formula
p2 + 2pq = q2 = 1.0
Predicts the frequency of genotypes in a gene pool that is not evolving
p2 = frequency of homozygous for one allele; q2 = frequency of homozygous for other allele; 2pq = frequency of heterozygotes
What causes variation in a gene pool?
Sexual Reproduction - random segregation and assortment of alleles; crossing-over in Prophase I
Mutations
In these population will the Hardy-Weinberg formula predictions be seen?
Mechanisms of Evolution: Which alleles will be maintained?
Genetic Drift
Gene Flow
Natural Selection
Consequences of Genetic Drift
Bottleneck Effect
Founders Effect
What is a Species?
Groups whose members can interbred to produce fertile offspring (i.e. also able to interbred)
Reproductive Barriers
Is this a good definition? What about bacteria? fossils?
How do new species originate?
What is the time frame for speciation?
Evidence of Evolution
Fossil Record
Biogeography
Comparative Anatomy: homologous structures
Comparative Embryology
Molecular Biology
Coevolution
Full transcript