BIOL 336 Lecture Notes - Lecture 3: Habronattus, Paraphyly, Polyphyly
Document Summary
Trying to detect signals of lineages million years ago in genomes that have evolved often, Broad agreement from different data, different methods, different assumptions: our results are consistent, even with different characters with different models of evolution. Natural selection has no foresight: there are always disadvantages in. Systematics: field of biology that reconstructing phylogeny. Convergence: didn"t inherit traits from a common ancestor with this. Reversal: an ancestor had the state, then lost it. Characters: an observable feature/variable of an organism or gene. States: one of the alternative condition a character can have; the value. The ancestral state: the state in the clade"s mrca. Derived state: state that different from the ancestral state. Two types of non-monophyly: of a character of an organism/gene. Move down the tree, node by node: sex chromosomes: at reconstructing the traits of our ancestors have a privileged role in revealing ancestral states. Use of model organisms to understand human is implicitly an attempt.
