Darwinian evolution I III IV V VI Introduction

Darwinian evolution I. III. IV. V. VI. Introduction Influences on young Darwin Definition of evolution Mechanism Example Pieces of evidence supporting theory

I. Intro to Darwinian evolution • Unifying principle of biology • Helps to explain how change has occurred over time • Nothing magical about how it occurs

Influences on a young Charles Darwin

II. Influences on a young Darwin

A. Family Background • 1. religious family • 2. professions considered • 3. naturalist

B. Voyage of the Beagle

C. Galapagos Islands • • 1. Tortoises 2. Iguanas 3. Finches 4. Adaptive radiation

D. Thomas Malthus • 1. Economist • 2. Malthusian Principle • 3. Introduced the concept of struggle

E. Artificial selection • 1. man’s selection of breeding pairs to produce desired “phenotype” • 2. examples • 3. significance

III. Definition of evolution • A. Slow and gradual change over time in organisms appearance in response to environmental change • B. Organisms living today appear different than their ancestors • C. Living organisms share common ancestors

IV. Mechanism of Change/Natural Selection • A. Variation exists in all populations • B. Reproductive potential • C. Variable fitness • D. Environmental carrying capacity • Differential reproduction • Slow gradual change in phenotype

V. Example of evolutionary change • Size of beagle ears • Environment changes • Results

VI. Evidence of evolutionary change • A. Vestigial structures • B. Homologous structures

Evidence cont. • C. Common embryology

Evidence cont. • C. Common embryology • D. Fossil record – 1. Missing links

Evidence cont. • C. Common embryology • D. Fossil record – 1. Missing links – 2. Phylogenies