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Lecture 17 - Bio 121 Lecture 17 origin of species A...

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Bio 121 Lecture 17 – origin of species A. Defining species a. Biological species concept – genetically distinctive group of natural populations that share a common gene pool and are reproductively isolated from other such groups under natural conditions b. Limitations b.i. Since it assumes interbreeding, it does not apply to asexual organisms b.ii. Since fossils don’t interbreed, it doesn’t work well with extint species b.iii. Species that interbreed in labs, but not in nature B. Mechanisms of speciation (splitting 2 populations that are interbreeding into different populations that are not interbreeding) a. Allopatric – other homeland a.i. A population to form a new species while its geographically isolated from the parent population (mountain, ocean, river) a.ii. When a species becomes allopatric, there is chance of speciation a.iii. Favorable conditions for allopatric speciation a.iii.1. Population is usually small and usually occurs at edge of population so it may already be a little different a.iii.2. Founder effect, initially a difference a.iii.3.
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