PPT-Darwin’s Theory of Evolution by Natural Selection

Louise Livesey Definitions from OED Online EVOLUTION The origination of species of animals and plants as conceived by those who attribute it to a process of development from earlier forms and not to a process of special creation . Scientific Theory. Social use of the word “theory”. Not the same as in science. Implies a hunch or a casual guess. Scientific Theory. 1. Highly probable explanation based on vast collections of scientific data. Evolution. Believed to be 4.5 billion years old. Thought to have had a very anaerobic atmosphere. Earliest organisms were able to survive primitive environments. Prokaryotes that resemble today’s bacteria. Evolution- changes in the characteristics of groups of organisms over time . Charles Darwin was the first to propose a feasible . mechanism. for evolution. It is called . natural selection. . . Evolution by Natural Selection is a theory. . Stephen Jay Gould. Stephen Jay Gould (1941-2002). an American . paleontologist. , . evolutionary biologist. and . historian of science. . He was also one of the most influential and widely read writers of . different. species alive today. All life shares . common. characteristics. The Earth is very . old. Life. is very . old. Life has . changed. over time. The changes have been . little changes over long periods of time. Danielle Donahue. Aa. A. daptation: a well fitted feature that aids in the survival of a population. Example: the blind cave salamander has no use for eyes because they live in complete darkness. Bb. Charles Darwin was born February 12 1809 in Shrewsbury England. . He came from a long line of doctors, his father was a medical doctor, and his grandfather was a botanist.. He was described as someone who “loved to explore nature”. EARLY THEORIES OF EVOLUTION. DARWIN, WALLACE, & . THE ORIGIN. DARWIN’S THEORIES OF EVOLUTION. WHAT EVOLUTION IS NOT. MODERN SYNTHESIS. BIOGEOGRAPHY. SCHOOLS OF SYSTEMATICS. Early theories of natural history and classification treated living things as immutable and were . Modern Theory of Evolution) . Review Questions. What structure does this picture represent?. Answer: Homologous Traits . What is an adaptation?. A) . A test for natural selection . B) . A. . physical or behavioral characteristic that has developed to allow an organism to better survive in its environment. Evolutionary Ideas. A. lthough Darwin is given much credit for evolutionary theory, he was not the first person to come up with the idea.. Evolution is the change in a population over time.. The concept of evolution had been discussed for more than 100 years prior to Darwin’s theory.. His Case. THINK ABOUT IT . Darwin wrote up a complete draft of his ideas about natural selection, but he put the work aside and didn’t publish it for another 20 years. . Darwin knew that his own theory was just as radical as Lamarck’s, so he wanted to gather as much evidence as he could to support his ideas before he made them public.. Background Info: Charles Darwin. Set sail on the HMS . Beagle. . 5 year trip around the world. Naturalist: a person who studies the natural world. He wanted to learn about the living things he saw on the voyage . Charles Robert Darwin. . (1809-1882) was an English naturalist who . born on 12th February, 1809. at Shrewsbury, England. . He went on . voyage. . (trip, expedition, tour). for five years (1831 to 1836) and . . The process by which organism change over time. Based on science, not opinion.. Darwin. :. Evolution is descent with modification. Evolution. :. changes through time. Species accumulate difference.