Natural Variation  Even within a species individuals vary from each other.

Slides:

Advertisements

Similar presentations

Evolution and Darwin.

Advertisements

Darwin Presents His Case

15-3 Darwin Presents his Case

Darwin & Natural Selection

Evolution Overview. Evolution Evolution is change over time Evolution is change over time It was first studied by Charles Darwin (1831) It was first studied.

Darwin’s Theory of Evolution

DARWIN. DESCENT WITH MODIFICATION All species of organisms living on Earth today are descended from ancestral species All species of organisms living.

Darwin Presents His Case 15-3

Introduction to Evolution Chapter 15. DO NOW !!! What is the connection between the words EVOLUTION AND REVOLUTION.

Evidence for Biological Evolution. Evolution results from 4 factors:  Potential for a species to increase in number  Heritable genetic variation  Due.

Ch. 15 Darwin’s Theory of Evolution

Ch 15- Darwin’s Theory of Evolution Evolution- change over time – Process by which modern organisms have descended from ancient organisms Theory- well.

The Theory of Evolution Biology B/Evolution. Important Concepts  Natural Variation = Differences among individual organisms of the same species.  Exists.

The Theory of Evolution

Ch. 15 Darwin’s Theory of Evolution

15-3 Darwin Presents His Case Slide 1 of 41 Copyright Pearson Prentice Hall Publication of On the Origin of Species In his book, Darwin: proposed a mechanism.

Natural Selection and Evolution!. Why two types of clover? What advantages does the striped clover have? The plain? How does cyanide help/hurt these plants.

Chapter 15: Darwin’s Theory of Evolution

Chapter 15: Darwin’s Theory of Evolution Biology- Kirby.

Do Now What different ways do these animals use to move about? What traits does each animal have that help it move about as it does?

Why do scientists use a classification system? To organize many diverse organisms (biological diversity) What is a theory? A well-supported,testable explanation.

Chapter 15: Darwin’s Theory of Evolution

Evolution & genetic variation

Slide 1 of 41 Copyright Pearson Prentice Hall 15-3 Darwin Presents His Case.

Chapter 15-3: Darwin Presents His Case

Theory of E v o l ut i o n Chapter 15. What is Evolution? Change over time The process by which modern organisms have descended from ancient organisms.

Evolution The Puzzle of Life’s Diversity. Charles Darwin Proposed the Theory of Evolution Proposed the Theory of Evolution The father of evolution The.

How Did Darwin Explain Evolution? Hw: Rd 418 – 422 Q 1-4 p 422.

Objectives: 1)Describe how natural variation is used in artificial selection. 2)Explain how natural selection is related to species’ fitness. 3)Identify.

End Show Slide 1 of 41 Copyright Pearson Prentice Hall 15-3 Darwin Presents His Case.

Darwin’s On the Origin of Species Darwin waited more than 25 years before he published his thoughts on evolutionary change. He received both positive.

Lesson Overview Lesson Overview Darwin Presents His Case Lesson Overview 16.3 Darwin Presents His Case.

Natural Variation & Artificial Selection. Natural Variation & Artifical Selection Darwin, through many observations, explained evolution by natural variation.

Darwin’s Theory of Natural Selection. POINT > Review the ideas that shaped Darwin’s thinking POINT > Describe postulates that underlie natural selection.

Q: What evidence shows how different species are related? Habits of mind for today: At the end of class, check the boxes that apply to your work today.

Evolution Notes. Part 1 Charles Darwin Born in England Traveled around on HMS Beagle - Set Sail in 1831 Collected many specimens Father of the idea of.

Evolution Evolution- changes that have transformed life over time.

Darwin & Natural Selection

Darwin & Natural Selection

15.3 Objective: to be able to explain how Darwin presented his case to others.

III. Darwin Presents His Case

15-3 Darwin Presents His Case

The Theories of Evolution

Chapter 16: Darwin’s Theory of Evolution

Darwin Presents His Case (Ch 16.3)

Theory of Evolution Evolution: The process of change over time

Journal #3- Darwin described natural selection in his book, On the Origin of Species, in the following way: “I have called this principle by which each.

Evolution & Natural Selection

Natural Variation & Artificial Selection

Natural Variation & Artificial Selection

What has caused SUPERBUGS (antibiotic resistant bacteria) like MRSA?

Natural Selection Struggle for Existence Survival of the Fittest

Natural Variation & Artificial Selection

NATURAL SELECTION The Struggle for Existence - Darwin realized that high birth rates and a shortage of life's basic needs would force organisms to compete.

Evolution Chapter 15.

Natural Selection Struggle for Existence Survival of the Fittest

16.3 Darwin Presents His Case

16.3 Darwin Presents His Case

Warmup: Open your lab book to the Kerosene Karl activity we did yesterday in class. Make a graph (in your lab book--after the questions is fine) with the.

15.3 Darwin Presents his Case

Darwin’s Theory of Evolution by Natural Selection

Q: What evidence shows how different species are related?

Darwin’s Ideas.

15-3 Darwin Presents His Case

EVOLUTION: VOCABULARY part 1

Darwin Presents His Case

Notes: Theory of Evolution

Darwin Presents His Case

Darwin Presents His Case

Presentation transcript:

Natural Variation  Even within a species individuals vary from each other

Discussion Question These are the same species of moth. The two are naturally occurring variations. Describe situations where the coloration would be an advantage for the moth.

How We Use Variation  Artificial selection – nature provides the variation and humans select the variations they find useful

Evolution by Natural Selection  Natural Selection – the traits being selected (which therefore increase over time) contribute to an organism’s fitness in its environment

Natural Selection  The struggle for existence  Survival of the fittest  Descent with modification

Struggle for Existence  Members of each species compete regularly to obtain food, living space, and other necessities of life  Run fast, behavioral tactics, camouflage

Survival of the Fittest  Individuals better designed for the environment where they live will survive and reproduce most successfully  Fitness is the result of successful adaptations

Survival of the Fittest  Fitness – the ability to survive and reproduce in a specific environment  Adaptation – an inherited characteristic that increases an organism’s chance of survival

Discussion Question Give three examples of animals with designs that help their survival.

Tale of the Peacock Online Video Clip  ators/course/session4/explain_a.html ators/course/session4/explain_a.html  Or: “Why Sex?” (PBS Evolution Series) minutes 17:00 – 28:00

KEY CONCEPT Over time, natural selection results in changes in the inherited characteristics of a population. These changes increase a species’ fitness in its environment.

Common Descent

Evidence for Evolution 1) Fossil record 2) Animals with similar selection pressures evolve similar features 3) Homologous structures 4) Similarities in early development

Genetic Toolkit Online Video Clip  ators/course/session4/engage_a.html ators/course/session4/engage_a.html  (5 min)

similar habitats & similar structures

homologous structures

similarities in embryology