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lecture 12 - BIO10 student - evolution

lecture 12 - BIO10 student - evolution - Lecture 12 how...

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Lecture 12: how populations evolve (Ch 13)
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Plan for today 1. Clicker questions 2. Evolution: theory, observation, or both? 3. Evidence for evolution 4. Mechanism of evolution
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When a black cat is crossed with a white cat all the offspring are the same shade of gray. The most likely explanation for this is: a. Incomplete dominance b. Codominance c. Complete dominance d. Multigene Inheritance Clicker Question
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What are homologies? a. Having different traits resulting from not being related b. Having similar traits resulting from not being related c. Having different traits resulting from common ancestry d. Having similar traits resulting from common ancestry Clicker Question
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Evolution: theory, observation, or both? - Evolution Genetic change in a population over time - Evolution is both an observation (we see it happening today) - AND a theory Extensive evidence supports that evolution has happened since life began
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Evidence for evolution 1. Direct observation we see it happening today 2. The fossil record 3. Biogeography 4. Comparative anatomy 5. Comparative embryology 6. Molecular biology
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MRSA: Methicillin-Resistant Staphylococcus aureus
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MRSA strains (lineages) can be traced
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Large reproductive rates under short periods of time propagate mutations quickly
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The Ragweed that would not die
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Genetically modified corn not working anymore?
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1 st year Cry3Bb1 GMO corn increased survival Less root worm damage 3 years later Root worm resistant to Cry3Bb1 GMO corn decreased survival More root worm damage
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Evolution occurs within an organisms lifetime a. True b. False Clicker Question
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Which species would evolve the fastest?
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