BIO 200 Lecture Notes - Lecture 20: Spartina, Spartina Alterniflora, Disruptive Selection
3 Nov 2017
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Taxonomy [largest to smallest]: domain, kingdom, phylum, class, order, family, genus, species. Reproductively isolated populations: sympatric species: ranges overlap, allopatric species: ranges don"t overlap, because the range is too big we usually cannot use the biological definition, and we rely on typological definition. Problems with the biological definition & identifying species: polymorphic species: species with many different types of individuals. Sibling species: virtually identical species [but they don"t interbreed: e. g. pheparana heparana, p. lamprosana, p. limitata} are all species of moths but cannot breed, e. g. supportive lemur"s in madagascar. Even though they live in the same area, there are 7 different species of lemur and they don"t interbreed. The end populations can"t interbreed: asexual species: can"t use biological species definition e. g. amoeba reproduce via mitosis. Fossil species: can"t use biological species definition e. g. t-rex look different from other dinosaurs and dinosaurs can"t interbreed among species. Cannot produce other mules: populations do not strive to become species.
