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Natural Selection. I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection. Charles Darwin.

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Presentation on theme: "Natural Selection. I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection. Charles Darwin."— Presentation transcript:

1 Natural Selection

2 I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection. Charles Darwin from "The Origin of Species" Life Sciences-HHMI Outreach. Copyright 2006 President and Fellows of Harvard College. Used by permission of Darwin Day Celebration (at DarwinDay.org),

3 CHARLES DARWIN – English English Traveled around the world on the Beagle (ship) Traveled around the world on the Beagle (ship) Most of trip was among the Galapagos Islands Most of trip was among the Galapagos Islands Believed that the earth was 6000 years old and that all plants and animals were unchangeable over time Believed that the earth was 6000 years old and that all plants and animals were unchangeable over time During his travels, he observed many live species, as well as fossils During his travels, he observed many live species, as well as fossils He did not understand why some species survived while others were going extinct He did not understand why some species survived while others were going extinct These ideas went directly against his beliefs These ideas went directly against his beliefs

4 Darwins Observations From island to island, he noticed that the species of mockingbird, finches, and other animals varied. From island to island, he noticed that the species of mockingbird, finches, and other animals varied. Many of the species Darwin collected had not yet been discovered or classified Many of the species Darwin collected had not yet been discovered or classified Darwin took his collections and drawings home and after reading essays and studies by many other scientists (Gould & Mathus), he developed the idea of natural selection Darwin took his collections and drawings home and after reading essays and studies by many other scientists (Gould & Mathus), he developed the idea of natural selection

5 5 Principles of Natural Selection 1. Individuals in a population show variation. 2. Variations can be inherited. 3. Organisms have more offspring that can survive under normal circumstances. 4. Variations that increase reproductive success will have a greater chance of being passed on from generation to generation. 5. A population will slowly change over time in response to the environment.

6 Darwin… By 1840, Darwin had developed the theory of natural selection. By 1840, Darwin had developed the theory of natural selection. He then published On the Origin of Species by Means of Natural Selection He then published On the Origin of Species by Means of Natural Selection On the last page of this book, he called his theory evolution On the last page of this book, he called his theory evolution –Evolution is what the process is called ~ natural selection is HOW evolution happens Another researcher, Wallace, also wrote a similar book at the same time and both books were published and presented to the scientific community. Another researcher, Wallace, also wrote a similar book at the same time and both books were published and presented to the scientific community.


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