ShabelEvol6 - Bio 1B, Summer 2009 Professor Alan Shabel...

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Bio 1B, Summer 2009 Evolution, Lecture 6 Professor Alan Shabel Page 1 of 2 Updated on 30 June 2009 EVOLUTION, LECTURE 6: SPECIATION (501–504, 525–531) Before we discuss that “mystery of mysteries” (speciation), we need to establish our species concepts. Numerous such concepts are available in the published literature, but we will focus on three of them: the morphological species concept (MSC), the biological species concept (BSC), and the phylogenetic species concept (PSC). The MSC distinguishes among species based on appearance (morphology, anatomy). This is a widely used approach that is grounded in common sense. If two things look very much alike, they are the same species, if they appear different, then they are assigned to different species. The application of genetic analysis to the study of organismal relationships has confirmed most hypotheses of organismal relationships based on morphology alone, albeit with many notable, and sometimes spectacular, exceptions. The MSC continues to serve scientists well, particularly paleontologists who often have only the gross form of organisms available for study. Phenotypic plasticity
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ShabelEvol6 - Bio 1B, Summer 2009 Professor Alan Shabel...

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