BIOL 101 1nd Edition Lecture 23 Outline of Last Lecture I II Biological Species Concept Reproductive Barriers a Pre zygotic Barriers b Post zygotic Barriers Outline of Current Lecture I Reproductive Barriers a Speciation b Hypotheses Current Lecture Two populations must have gene flow blocked with or without a physical barrier once this form of microevolution is blocked natural selection mutation and genetic drift make two different species that eventually cannot interbreed II How do reproductive barriers form These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute A Speciation 1 Two species from one ancestral species common ancestors where they intersect four spots Co speciation hypothesis human head and chimp lice lineages diverged at the same time that hominins and ancestral chimps diverged New niche hypothesis human pubic and head lice lineages diverged because hominins lost their body hair and developed two hair niches
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