05)PhylogenyHistorySpr11Posted

05)PhylogenyHistorySpr11Posted - Announcements Vitalism...

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1 Announcements Thermodynamics and Expectations HW due Friday! Diagnostic Exam work (if necessary) due next Wednesday Grading underway. Grade of … 4 - means you need to do the assignment 5 - recommended 6 - OK Remember, back to PLS1140 on Friday Vitalism … Physicochemical opportunities for the evolution of life Life’s challenge is to transform ___ into useful forms at the right sites and the right times. Genomes encode for the specific mechanisms … Deep origins: Reconstructing History And why it matters
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2 Common origin of life There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one ; … from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved . Darwin described a “Great tree of Life” Living species at the tips Branches are groups of closely related species Branch points are speciation events The Tree of Life - Phylogeny What is a phylogeny? The branches and connections on Darwin’s tree of life. Produced by two evolutionary events T I M E Willi Hennig - 1950, 1966 Two principle techniques for reconstructing phylogeny Outgroup analysis Parsimony Not our focus, but … Trees are very useful tools! For … Phylogenetic analysis Cladistic Methods
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3 Original Typewriter (1874) QWERTY key arrangement Why? Seems odd? home.earthlink.net/ ~dcrehr/whyqwert.html ht p:/ home.earthlink.net/~dcrehr/first w.html Historical Constraint and QWERTY E.g. “vestigial” organs Reduced wings Baleen whale teeth, limbs Sightless eyes Etc. http://www.kiwirecovery.org.nz
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This note was uploaded on 02/01/2012 for the course BSCI 207 taught by Professor Higgins during the Spring '08 term at Maryland.

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05)PhylogenyHistorySpr11Posted - Announcements Vitalism...

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