Points re: “Spandrels” Spandrels (p.581) Dr. Pangloss (p.583) First target? (p.583) Natural selection can’t drive extinction (p.584) Only brake upon perfection?

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Presentation transcript:

Points re: “Spandrels” Spandrels (p.581) Dr. Pangloss (p.583) First target? (p.583) Natural selection can’t drive extinction (p.584) Only brake upon perfection? (p.585) Tyrannosaurus? (p.587) Bluebirds? (p.588) G&L other possibilities? (p.590) “Baupläne”? (p.593) In ecology too… OEB 192 –

What is adaptation? Noun vs. verb (vs. acclimation) Noun: “…[A] feature is an adaptation for some function if it has become prevalent or is maintained in a population… because of natural selection for that function” (Futuyma, p.355) “… the good fit of organisms to their environment” (Gould & Lewontin, 1979)

How study adaptations? A. B. vs.

How study adaptations?

Are mutations random & independent of selection? Luria & Delbrück experiment (1943)

Joshua & Esther Lederberg (1952) Are mutations random & independent of selection?

Darwin and natural selection Two major tenets (Darwin, 1859) : –“[A]ll species, living and extinct have descended without interruption from one (or a few) original forms of life”

Monday (9/12): Phylogeny and the tree of life (pages , )