CAS AN 102 Study Guide - Final Guide: J. B. S. Haldane, Theodosius Dobzhansky, Sewall Wright
27 Mar 2014
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Document Summary
Founder of pitcairn island had blue eyes, has lots of children, and creates new population of blue eyes. Ellisvan creveled syndrome in amish (dwarfism, extra fingers) Genetic bottleneck caused by migration or disease leads to less variation and changes in gene frequency (severely reduces population size and genetic diversity) Fixation: when one allele is lost (frequency reaches 1 or 0) The average is less fit so selection eliminates the average. Highest survival of babies with average birth weight. Ex: higher hemoglobin concentration in blood for people in higher altitudes in. Allows us to see if evolution is taking place. If no forces of evolution take place genotype frequencies will remain the same. Phylogenetics: study of evolutionary relationships among a group of species. Cladogram: diagram of the evolutionary relationships of species. Monophyletic: the group includes the last common ancestor and all of its descendants. Paraphyletic: the group includes the last common ancestor and some but not all of its descendants.
