NATS 1940 Lecture Notes - Lecture 30: Pentadactyl, Ulna, Humerus
4 Feb 2020
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Document Summary
The evolutionary history (tree) of a species or group of species. Which is the study of physical (morphological/appearance) and biochemical resemblances between species. Used as a basis for inferring evolutionary relationships. Use of dna sequences to infer evolutionary relationships. Allows comparisons between organisms that are physically very different from each other. Is the branching diagrams that show evolutionary relationships. Phylogenetic trees are constructed using patterns of shared traits, either physical features or dna sequences. Divergence of 2 lineages from last common ancestor. The simplest explanations is most likely correct. Trees that require the fewest mutations or physical changes are most likely correct. Ii) use of analogous features to construct phylogenetic trees must be avoided: Using analogous traits which are traits that rose independently by convergent evolution or independently evolution will result in incorrect trees. When 2 biological structures are physically similar to each other, may be due to: Shared trait was present in most recent shared ancestor.
