Figure14 - Some assumptions made by the users of molecular...

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Figure 1 Molecular biology and phylogeny .The most promising developments in formulating a phylogeny  for the entire tree of life come today from molecular biology, where new tools and techniques allow  researchers to use as character states the  molecular sequences  of  amino acids  as well as those  of  nucleotides  in  nucleic acids . The latter is the most fundamental of comparisons for, of course,  the genes control the structure of life itself. The closer the similarity in sequences of molecules  among groups of organisms, the closer the relationship of the groups. Widely different sequences  indicate a different evolutionary history and ancestry. 
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Unformatted text preview: Some assumptions made by the users of molecular sequencing include: Phenotypic (outward appearance) evolutionary changes accompanied by genetic (hereditary) changes occur over time in organisms. Long time intervals result in the accumulation of more changes. Organisms that have the most similarities in their gene sequences are more closely related than those with fewer; they have had a shorter time in which to evolve different phenotypes and genotypes. The groups with widely different sequences must have separated at an earlier time in the evolutionary past....
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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Figure14 - Some assumptions made by the users of molecular...

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