Anthropology 1026F/G Lecture Notes - Symmetry In Biology, Macroevolution, Genetic Drift
17 Aug 2012
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Variability & variation within species selected for survival. How it happens at the cell level (micro) Macro = evolution above species level w/ focus on formation of species (speciation) Of organisms capable of interbreeding & producing viable fertile offspring: viable = functioning as individual organism, fertile = able to produce offspring. Macroevolution key to understanding organisms within last 500 million years. Isolating mechanism: separates breeding pop, prevents gene flow, creates divergent subspecies. Genetic separation, genetic drift, social factors: cuckoo bird calls, darwin"s finches on differing islands. Variational change: gradual change over time. Punctuated equilibria: long period of stability punctuated by periods of rapid change. Some types of genetic change have profound affect. Homebox gene = responsible for large-scale effects of growth. Heterochrony = change in timing of developmental ___________ Traits defining group of organisms because of chared ancestry. Eg. bilateral symmetry in vertebtrates (left & right side same in most organisms w/ spines.
