GPHY 207 Study Guide - Quiz Guide: Advantageous, Umber, Parallel Evolution
Document Summary
!- inheritance: mendel (father of genetics) worked on linking phenotypes to genotypes! Each characteristic determined by two hereditary factors (genes), one from each parent that decides which gene is dominant and which is recessive: molecular structure of nucleic acids (watson and crick)! Vicariance i: extreme environmental change creates barrier within range of an ancestral. Sympatric: geographic overlap of populations of the ancestral species is extensive: resulting from adaptive radiation, result from intense competition! Parapatric: overlap is minimal, almost allopatric but overlap in a zone where depressed tness of inter-population matings leads to selection for isolating mechanisms! Habitat selection= isolating force, disruptive selection (subpopulations pulled diff. ways)! Rapid speciation can occur, small gene pool and limited genetic drift (founder principle)! Limited genetic diversity causes bottleneck (not enough variability to fuel" development of new species), determines whether new species forms or not! Drive towards speciation may not be a driver for dispersal!
