BIOL-K - Biology BIOL-K 103 Lecture Notes - Lecture 11: Ford Fusion Hybrid, Hybrid Zone, Punctuated Equilibrium
15 Nov 2016
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Document Summary
Studying hybrid zones if diverging populations come into secondary. Area of overlap between two recently diverged populations in which inbreeding takes place and hybrid offspring are common. Hybrid initially formed but over time hybrid less t than either parent alone and so hybrid is no longer produced. Hybrid is just as t as either parent alone and over time differences in parental species weaken and hybrid population enlarges. Hybrids more t than either parental species and over time hybrid stabilizes as new species. Rate of evolutionary change punctuated equilibrium long periods of stasis interrupted by short periods of rapid speciation no intermediates. Phyletic gradualism evolution proceeds continuously over long periods intermediate changes evident. Large-scale phenotypic changes in populations at the species level and higher e. g new species, genera, families, Origin of evolutionary novelties preadaptations are variations of preexisting structures structure originally ful lled one role but through natural selection was adapted for a different role.
