01:119:115 Lecture Notes - Lecture 21: Species Problem, Reproductive Isolation, Macroevolution
27 Aug 2019
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Document Summary
Speciation - processes where one species splits into two new species. Microevolution - changed over time in the alleles in a population. Macroevolution - broad pattern where species are formed: biological species concept. The biological species concept = species is a group of populations whose members have. Gene flow between populations keep genotypes similar: limitations of the bsc. Potential to interbreed in nature and produce viable , fertile offspring . How do we know if these dinosaurs are the same or different species : other species concepts. Species is defined by its niche (role in environment) Reproductive isolation = barriers that impede two species from producing viable, fertile offspring. Hybrids = offspring of crosses between different species. Reproductive isolation can be classified by whether factories act before or after fertilization and creation of a zygote. Two species encounter each other rarely, or not at all, because they occupy different habitats. If you never run into them you cannot mate.
