PCB 4674 Lecture Notes - Lecture 1: Pitx1, Selective Breeding, Microevolution
23 Aug 2016
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Document Summary
Current evolutionary theory descent with modification a term introduced by darwin also recognized by other researchers of the time consists of five elements, each of which are: observable experimentally testable: descent with modification. Characteristics of species change over time: microevolution, number of species changes over time one species diverges and become two speciation, new life forms derive from earlier forms new species evolves, ancestor disappears, macroevolution. All species derive from shared ancestors thus all species are related. Earth and life are very very old billions and billions of small evolutionary changes: microevolution. Ted garland"s mice fast group and a control (mixed) group fast x fast (selection) control x control (no selection) 24 generations, fast x fast = 2. 78 x faster than control x control: dogs all breeds descended from wolf. Changes in natural populations still must be selection just not deliberately introduced as in artificial. Example mustard plants germinate, grow, flower, seed, die single season.
