BIO SCI 94 Lecture Notes - Lecture 5: Hybrid Zone, Allopatric Speciation, Phylogenetic Tree

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

Explain the roles that gene flow, selection, genetic drift, and mutation play in the process of speciation. Predict what will happen when two partially divergent populations come into contact again under various circumstances. Three criteria to identifying species: morphospecies concept, biological species concept, phylogenetic concept. To illustrate a limitation of the biological species concept as compared to the other two. Individuals considered to be in same species if they look alike. Species include those individuals in the twig of a phylogenetic tree. Use snip test to determine if in monophyletic group. If two individuals can successfully produce offspring, they are in the same species. You can attach new species as defined by the biological species concept to a phylogenetic tree of life, thus confusing the two concepts. Clicker question: sometimes individuals that are assigned to different species according to the biological species concept are able to mate successfully.