Lecture 1 Introduction SEP

EvolutionBio111 Spring 2010 : 

EvolutionBio111 Spring 2010 Bio

BIO111 Evolution Spring 2010 : 

BIO111 Evolution Spring 2010 Instructor Text / Readings / Blackboard Course Description Course Requirements Attendance / Participation Classroom deportment Reading, daily study Slides, notes Communication

BIO111 Evolution Spring 2010 : 

BIO111 Evolution Spring 2010 Course Requirements Assignments Exams Quizzes Make-ups Labs Grading ~ NO EXTRA CREDIT OFFERED

BIO111 Evolution Spring 2010 : 

BIO111 Evolution Spring 2010 Students with disabilities Inclement weather Provisions

What is Evolution? : 

What is Evolution?

Why do we study evolution? : 

Why do we study evolution? To understand who we are as human beings Where did we come from? Why are we here? What makes us unique? To understand the natural world around us How has the earth changed over time? How are we connected to other organisms?

Why do we study evolution? : 

Why do we study evolution? Understanding evolution = introduction to many different scientific disciplines Anatomy Biology Chemistry Genetics Geology Medicine Understanding evolution makes us better thinkers Regardless of profession Better citizens of society

Why do we study evolution? : 

Why do we study evolution? Can we manipulate evolution? Controlled breeding Cattle Dogs Crops Microbial genetics Gene insertion Protein production (recombinant techniques)

Introduction to Evolution : 

Introduction to Evolution What sparked Darwin’s imagination?

Cell Theory : 

Cell Theory 1665 – compartments within bark of a tree = cells Cell = highly organized compartment; bounded by a plasma membrane; containing all the chemical components for the reactions needed to sustain life; capable of copying itself 1670s – complex structures (plants) composed of many cells 1800s – all organisms consist of cells

Cell Theory : 

Cell Theory Two parts: all organisms are composed of cells all cells arise from existing cells

Theory of Evolution : 

Theory of Evolution Just as cells arise from pre-existing cells, various species are related by common ancestory – NEW! 1858 Scientific papers presented in London (separately) by both Darwin and Wallace stating same basic idea: ~ Species characteristics change over time ~ Darwin wrote Origin of the Species described “descent with modification” How does this modification occur?

Natural Selection : 

Natural Selection Requires individuals within a population to vary in a characteristic/trait that is heritable Requires that within a particular environment, certain versions of these heritable traits provide a selective advantage to the individual survival reproduction

Natural Selection : 

Natural Selection If a heritable characteristic confers a reproductive advantage, individuals with that characteristic will reproduce more often  more individuals with the characteristic

Natural Selection : 

Natural Selection Darwin and Wallace Individuals vary within a population Traits vary among individuals Population = a group of individuals of the same species living in the same area at the same time Trait = a distinguishing feature of an organism Natural selection acts upon individuals; evolutionary change affects only populations…

Evolution : 

Evolution Theory of Evolution The theory that all organisms on earth are related by common ancestry all organisms on earth have changed over time, predominantly by natural selection Evolution = Any change in heritable characteristic(s) of a population over time