Evolution by Natural Selectio1

Evolution by Natural Selectio1 - catalog his collections...

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Evolution by Natural Selection The idea (given voice by Lamarck) that species could change over time was not immediately acceptable to many: the lack of a mechanism hampered the acceptance of the idea as did its implications regarding the biblical views of creation. Charles Darwin and Alfred Wallace both worked independently of each other, traveled extensively, and eventually developed similar ideas about the change in life over time as well as a mechanism for that change: natural selection. Charles Darwin, former divinity student, former medical student, secured (through the intercession of his professor) an unpaid position as ship's naturalist on the H.M.S. Beagle. The voyage would provide Darwin a unique opportunity to study adaptation and gather a great deal of proof he would later incorporate into the theory of evolution. Darwin spent much time ashore collecting plant, animal and fossil specimens, as well as making extensive geological observations. On his return to England in 1836, Darwin began (with the assistance of numerous specialists) to
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Unformatted text preview: catalog his collections and ponder the seeming "fit" of organisms to their mode of existence. He eventually settled on four main points of the theory. 1. Adaptation : all organisms adapt to their environments. 2. Variation: all organisms are variable in their traits. 3. Over-reproduction: all organisms tend to reproduce beyond their environment's capacity to support them (this is based on the work of Thomas Malthus , who studied how populations of organisms tended to grow geometrically until they encountered a limit on their population size). 4. Since not all organisms are equally well adapted to their environment, some will survive and reproduce better than others -- this is known as natural selection . Sometimes this is also referred to as "survival of the fittest". In reality this merely deals with the reproductive success of the organisms, not solely their relative strength or speed. Adaptations of various organisms to their environments:...
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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Evolution by Natural Selectio1 - catalog his collections...

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