BIO120H1 Lecture : Lecture 21.docx

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18 Apr 2012
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BIO120H1 Full Course Notes
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BIO120H1 Full Course Notes
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Darwins said that all organisms are related as seen on his tree of life carolous linnaeus * Invented system of classifying life still used today. Allows for interpretation of origins and evolutionary history. Definitions taxon: a named taxonomic unit at any level. Taxa is plural taxonomy: the theory and practice of classification systematics: the study of biodiversity and the evolutionary relationships among organisms. Cladistics: -classifying species on the basis of their phylogenetic relationships. A single ancestor that gives rise to all speices in that taxon and no species in any other. Immediate ancestors in different groups critical step: identify ancestral trait. Diffiernt from derived trait, which is a trait that differs from ancestors. Homoplasy similarity of traits as a result of convergent evolution. (lead to downfall and beginning of phonetics) Origin of new trait in lineage which speeds up diversification. Comlumbines which have long nectar spurs . there.

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