08+BIOL151X+S11+Mechs+of+Evolution+1+Sakai

08+BIOL151X+S11+Mechs+of+Evolution+1+Sakai - 08 Mechanisms...

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1 08 Mechanisms of Evolution Mechanisms of evolution Natural selection Genetic variation Heritable traits Case study credit: Sean Carroll and HHMI
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2 Large-scale evolutionary patterns Fossil record shows that families and genera appear and disappear over short and long time scales (Paleontology). Homology in skeletal structure among genera indicates evolutionary relatedness (Comparative Anatomy). Every group of organisms demonstrates “descent with modification”
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3 Descent with Modification “Several classes of facts … seem to me to proclaim so plainly, that the innumerable species, genera, and families of organic beings, with which this world is peopled, have all descended, each within its own class or group, from common parents, and have all been modified in the course of descent.” Charles Darwin. The Origin of Species , ch 13 Darwin, C. R. Notebook B: [Transmutation of species (1837-1838)]. CUL-DAR121. Transcribed by Kees Rookmaaker. (Darwin Online, http://darwin-online.org.uk/)
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4 Natural Selection “Can it, then, be thought improbable, … that other variations useful in some way to each being in the great and complex battle of life should sometimes occur in the course of thousands of generations? If such do occur,
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08+BIOL151X+S11+Mechs+of+Evolution+1+Sakai - 08 Mechanisms...

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