More Related Content Similar to Lecture 3 (12) 3. Evolution and artificial selection
Speciation
Provisional definition:
Species – An interbreeding group of organisms that is
reproductively isolated from (does not interbreed with)
other groups of organisms
3
5. Evolution and Artificial Selection
Habitat selection in Drosophila – Rice & Salt 1988, 1990
dark, up, acetaldehde, early (5E)
4
6. Evolution and Artificial Selection
Habitat selection in Drosophila – Rice & Salt 1988, 1990
dark, up, acetaldehde, early (5E)
light, down, ethanol, late (4L)
4
7. Evolution and Artificial Selection
Habitat selection in Drosophila – Rice & Salt 1988, 1990
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8. Evolution and Artificial Selection
Habitat selection in Drosophila – Rice & Salt 1988, 1990
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9. Evolution and Artificial Selection
Habitat selection in Drosophila – Rice & Salt 1988, 1990
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10. Evolution and Artificial Selection
Habitat selection in Drosophila – Rice & Salt 1988, 1990
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11. Evolution and Artificial Selection
Habitat selection in Drosophila – Rice & Salt 1988, 1990
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Editor's Notes Corn: 80 years of artificial selection – began in 1896 at U Illinois!
Mice: dashed lines = selection reversed; dotted = stopped.
Mice: dashed lines = selection reversed; dotted = stopped.
Flies: # bristles QUADRUPLES in 90 generations
Not surprising that traits can evolve in response to artificial selection.
But can they form new species?
What do you think of this definition of speciation?
