evolution_final

evolution_final - BIEB 150 Evolution Fall 2001 Final 4th...

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BIEB 150 Evolution Fall 2001 Final 4 th December, 2001 Name……………………………. 1 Points on final………………. . Grade in class………………………. Exams will be available for pick up from Biology Student Affairs (Pacific Hall 1128) December 10-14, from 9:00-12:00 and 1:00-4:00 and January 7-11, from 9:00-12:00 and 1:00-4:00 (except December 12th from 9-11am and December 14th from 2-4pm). Points total is out of 100. Please show all working, to ensure partial credit. Best of luck and happy Christmas. 1. (8 points) Give an evolutionary explanation for the observation that.- i. The common cold is much less virulent than malaria. ii. In a review of the literature, Ewald (1994) showed that classical cholera resulted in about 15% mortality, and outbreaks were due to water-borne transmission about 83% of the time, whereas Salmonella causes <1% mortality and outbreaks are attributable to water-borne transmission <2% of the time. iii. HIV may have been present in the human population for >100 years, but AIDS only became a problem in the last 20 years.
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BIEB 150 Evolution Fall 2001 Final 4 th December, 2001 Name……………………………. 2 iv. The drug AZT, which interferes with reverse transcriptase (i.e. synthesis of DNA from RNA) reduces viral HIV viral counts when first administered to a patient, but loses its effectiveness over time. 2. (4 points) Bull et al. (1991, Evolution 45:875-882) studied the effects of a bacteriophage (a virus) on its host, the bacterium Escherichia coli. They described two experiments. In the first 'high partner fidelity' bacteria were cultured at such low density that there was little opportunity for phage to be transmitted between them, so that the only way they could be propagated was to the bacterium's offspring. In the second 'low partner fidelity' treatment bacteria were propagated at high density so that phage could be transferred between them. At the end of the experiment they studied the phage and found i) it had evolved to a smaller genome size in the 'high partner fidelity' line and ii) bacteria infected with this phage had higher growth rates than those infected with phage from the 'low partner fidelity' line. Explain these results.
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BIEB 150 Evolution Fall 2001 Final 4 th December, 2001 Name……………………………. 3 3. (4 points) Distinguish between allopatric and sympatric speciation. Which mode is commoner? Suggest one reason why.
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This note was uploaded on 09/01/2011 for the course BIEB 150 taught by Professor Staff during the Fall '08 term at UCSD.

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evolution_final - BIEB 150 Evolution Fall 2001 Final 4th...

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