NS101Lamarck&Darwin

NS101Lamarck&Darwin - NS101 Lamarck Darwin 1:38:00 PM...

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24/09/2007 12:38:00 Comparison of Darwin’s Model with Other Model (Lamarck) Providing a  Mechanism for Transmutation of Species Lamarck o Change in an individual’s lifetime is passed on to offspring (Heredity.  Believed that only positive traits could be passed on) o Evolution always results in greater complexity o Evolution is purposeful, goal-oriented (politically appealing, because it  meant you had some control over your own destiny Darwin o Change occurs between  generations o Evolution results in greater adaptation to the environment o Evolution has no goal; most changes are possible (natural selection,  survival of the fittest) Theory of Natural Selection (Malthus) o Arose from several observations Obeservation 1: natural populations have potential to increase  (produce more offspring than necessary) Observation 2: most natural populations and resources needed  to maintain them remain relatively constant Therefore, many must die young, fail to reproduce,  produce fewer offspring, or produce non-fit offspring Observation 3: individuals differ from one another in traits Those most adapted, leave the most viable offspring  (natural selection) Observation 4: traits are heritable Over many generations, differential reproduction will  result in changes in overall genetic makeup of a  population (evolution) o
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This note was uploaded on 04/16/2008 for the course NS 101 taught by Professor Schoch during the Fall '07 term at BU.

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NS101Lamarck&Darwin - NS101 Lamarck Darwin 1:38:00 PM...

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