PHYS P20 Lecture Notes - Lecture 7: Interactive Media, Phylogenetics, Reproductive Isolation
3 Dec 2018
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Document Summary
Microspheres simple aggregation of proteins, grow, bud off, could form sheets that cover organic rich media. Organisms can grow, reproduce and pass characterises to next generation. Some kind of genetic code, rna based, dna paced for growth, production. Types of species: biological species, morphological species, genetic species, and prokaryotic species. Morphological species identified based of differences in shape or structures. Genetic species identified based on differences in nucleic acid. Prokaryotic species strains that share a common set of biochemical properties. Phylotypes based on 97% similarity in dna coding for rrna sequences. Taxonomics the theory of naming and classifying organisms. Phylogenetics theory and practices of discovering the evolutionary interrelationships among organisms (mainly dna based now) Change fast enough to capture evolutionary divergence events. But change slowly enough so that the initial change is not obscured by subsequent changes. Choice of target sequence is determined by desired level of taxonomic resolution vs desired taxonomic range.
