Ch. 14, 15, and 16

Ch. 14, 15, and 16 - Ideas From Darwin's Time evolution all...

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Ideas From Darwin's Time evolution - all of the changes that have transformed life over an immense time; the biological history of life on Earth Before Darwin- species are fixed Earth itself is less than 10,000 years old and also relatively unchanging Georges Buffon- Earth is old Jean Baptiste Lamarck- life evolve; evolution- a process of adaptation mistaken explanation of adaptations - by using or not using certain body parts, an organism develops certain characteristics and would be passed on- inheritance of acquired characteristics adaptation - an inherited characteristic that helps an organism survive and reproduce in a environment The Voyage of the Beagle December 1831, the HMS Beagle set sail on a voyage around the world chart poorly known stretches of the South American coastline for the British navy 22-year-old college graduate, Charles Darwin. Darwin's main interest was to study the geology, plants, and animals encountered on the voyage plants and animals throughout the continent were quite distinct from the species of Europe; even the fossils species living in South America today were descended from ancestral species on that continent. Most of the species on the Galapagos were similar to, but different from the species of other islands Charles Lyell- gradual and observable geologic processes such as erosion could explain the physical features of today's Earth the slow processes of mountain building and erosion suggested an Earth that must be very old these processes could cause change on Earth; Darwin- apply this idea of gradual change to the evolution of Earth's life forms. Darwin Publishes His Theory 1838, Darwin read an essay on human populations written a few decades earlier by Thomas Malthus Overpopulation of humans causes human suffering, such as disease, famine, and homelessness 1844, Darwin wrote a 200-page essay that outlined his idea, but he didn't release it to the public 1858, Alfred Wallace, did come to the same conclusion. Wallace’s and Darwin's writings were jointly presented in public Darwin published his book The Origin of Species about a year later. Darwin's Two Main Points
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the species of organisms living on Earth today descended from ancestral species the descendants of the earliest organisms spread into various habitats over millions of years and they accumulated different modifications, or adaptations, to diverse ways of life- descent with modification a way to account for the diversity of life natural selection - the mechanism for evolution the process by which individuals with inherited characteristics well-suited to the environment leave more offspring on average than do other individuals The result is adaptation. This process of natural selection is another way of defining evolution Proof of evolution The Fossil Record Preserved remains or markings left by organisms that lived in the past-
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This note was uploaded on 02/15/2011 for the course BIO 112 taught by Professor Martin during the Spring '11 term at UT Arlington.

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Ch. 14, 15, and 16 - Ideas From Darwin's Time evolution all...

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