BIOL 101 1nd Edition Lecture 23Outline of Last LectureI. Biological Species ConceptII. Reproductive Barriersa. Pre-zygotic Barriersb. Post-zygotic BarriersOutline of Current Lecture I. Reproductive Barriersa. Speciationb. HypothesesCurrent LectureTwo 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 divergedNew niche hypothesis – human pubic and head lice lineages diverged becausehominins lost their body hair and developed two hair
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