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bio102 lecture 1-14 - Natural Selection(Ch 19 328-330...

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1/14/08: Natural Selection (Ch. 19: 328-330; 352-356) Outline What is natural selection? Darwin’s observations Necessary Conditions/ logic How does it work? Galapagos finches (evolution in action) HIV application Variability Finches on different Galapagos islands came from common ancestor Adaptation – “fit” between beaks and food Inheritance Offspring resemble parents Darwin thought a lot about his family Nervous stomach (so did his daughters) “close interbreeding” common in royal families Darwin married 1 st cousin Differential Reproductive Success Fact #1 – Overproduction of offspring/ struggle for existence Fact #2 – Individual variation Conclusion – unequal reproductive success “Survival of the fittest” An influence – Thomas Malthus (1798): An Essay on the Principle of Population populations grow faster than food supply population growth checked by famine, disease and war Darwin’s Finches- An Example
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