Evolution feb 27, 2008 lecture

Evolution feb 27, 2008 lecture - 1 Evolution the evidence a...

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1) Evolution: the evidence a) Evidence for evolution can be divided into 3 major categories : i) Homology – homology refers to characteristics that are similar as a result of common ancestry. You’re very similar. Similarity is the common descent. This is evidence of different species being related to one another at one point. A homologous characteristic is a trait that a species has that is shared with other species from descent. (1) Structural homology is underlying similarity despite a different lifestyle. Bat wings and whale wings have the same structural component, in spite of different bones and digits etc. They share the same structure but they look very different because they are different species and the wings have adapted to new lifestyles. The bat adapted to flight and the whale flipper have adapted to swimming lifestyle. (2) Homology vs. convergent evolution. Convergent evolution is similar trait between two species, but not from the same ancestor this can happen because the species goes through the same conditions and so natural selection causes
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Evolution feb 27, 2008 lecture - 1 Evolution the evidence a...

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