BS 148H Lecture 6 - BS148HLecture6 16:39...

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BS 148H Lecture 6 16:39 Genomes and Phylogenies Linnean Systematics o Is an hierarchical classification scheme (Domain, Kingdom, Phylum,  Class, Order, Family, Genus, Species) o It preceded evolutionary theory and is on phenetics Observed phenotypic similarities o Now that we know genetics we want to classify organisms in terms of their  genealogy not phenetics (meaning who is closely related to who in terms  of ancestry) Phylogenies  o Based on common ancestries  o Similarities due to shared ancestry are called homologies o Genes or other DNA sequences are homologous if the nature of their  similarity suggests that they descended from a common ancestors  sequence o Analogy is similarity due to convergent evolution Similarities between species that evolved independently not from a  common ancestor but are superficially and functionally similar  Homologies  o
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BS 148H Lecture 6 - BS148HLecture6 16:39...

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