Biology 1001A Lecture 20: Lecture 20
23 Aug 2017
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Lecture 20: there is a tendency among organisms living under the same conditions to develop similar body forms environment determining which body form is the most successful or natural selection, convergent evolution: phylogenetically more distantly related organisms(ex. Flight in birds and insects that have the same function and developed under the same conditions but have different evolutionary ancestors. Having wings is a homoplasy trait: parallel evolution: more closely related organisms (similar ancestor, homoplasy can occur by convergence or by parallelism. In class notes: whichever tree requires the fewest evolutionary change (gains or losses of a trait), is probably correct. Traits used for an outgroup comparison have to be genetically distinct.
