BIOS E-127 10.09.13 “Evolutionary speculation constitutes a kind of metascience, which has the same intellectual fascination for some biologists that metaphysical.

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Presentation transcript:

BIOS E “Evolutionary speculation constitutes a kind of metascience, which has the same intellectual fascination for some biologists that metaphysical speculation possessed for some mediaeval scholastics. It can be considered a relatively harmless habit, like eating peanuts, unless it assumes the form of an obsession; then it becomes a vice” (Stanier, 1970)

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

Joshua & Esther Lederberg (1952) “Replica plating” Are mutations random & independent of selection?

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, p.592)

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…

How study adaptations? A. B. vs.

How study adaptations?

Microbial systematics Formerly Pseudomonas (partial list): Ralstonia, Burkholderia, Hydrogenophaga, Sphingomonas, Methylobacterium, Cellvibrio, Xanthomonas, Acidovorax, Hydrogenophillus, Brevundimonas, Pandoraea

16S rRNA as phylogenetic marker Why a good molecule? 70S 30S 50S

Tree of Life: three “domains” Based on 16S rRNA (Woese, 1987):

Tree of Life: three “domains” Based on 16S rRNA (Pace, 1997):

Bacteria & Archaeal: all genomes as of 12 Feb., 2010 (Lee, Robinson & Marx, in prep)

Tree basics: meaning

Tree basics: rotation

Tree basics: shape

Tree basics: character change

Monday (9/20): Phylogeny & horizontal gene transfer & comment…