BI111 Lecture Notes - Lecture 8: Divergent Evolution, Normal Number, Anagenesis
Document Summary
Arti cial selection is an analogous process to natural selection. De nition of analogous: competitive in certain respects. Adaptive radiation driven by divergent selection on sub-population to utilize alternate food resources. Clicker: selections acts on the individuals phenotype, but evolution is manifested in genotype frequencies of the population. Anagenesis: accumulation of changes in lineages, with no change in number of species. Cladogenesis: accumulation of changes in 2 or more descendant species. Linear progression how we have evolved directly from apes. Evolutionary radiations lots of lineages (twist and turns) that died o . Lack of su cient genotypic variation for phenotypes to maximally response to selection. Natural selection is determined by what is going to keep you alive in the moent and does not have to do with the future because it is unpredictable. Environmental challenge is what brings about new genetic variation. Selection often acts on pre-existing variation what already existing ex.
