Oct5_NS2

Oct5_NS2 -...

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4. Understand how natural selection can cause new alleles (e.g., mutations) to  become removed/common/fixed in populations A. List  the four postulates of natural selection D.  Use  the concepts of heritable variation, constraints and trade-offs to explain why  natural selection does not work to “improve” traits or move toward a “perfect design” F.  Discuss  the causes and consequences of heritable variation and differential survival  and reproduction. G.   When prompted with one of the requirements for natural selection,  describe  (in your  own words) why natural selection could not operate without it H.  Compare  and  relate  the roles of reproduction and survival in natural selection K.  Summarize  (in words, arithmetic or pictures) how natural selection can change allele  and genotype frequencies, even though it only acts upon phenotype L.  Defend  the statement that selection is reactive, and not a directed process with  foresight M.  Explain  why natural selection does not operate for the “need” of a population N.  Justify  why traits/behaviors for the “good of the species” (but at the cost of an  individual’s fitness) would  not  be favored by natural selection
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Fall 2009 IB Workshop Series sponsored by IB academic advisors Student Conservation  Association Wednesday, Oct. 7 5:00-7:00pm  136 Burrill The Student Conservation Association (SCA) will offer 2  presentations (5-6pm and 6-7pm) about the all-expenses paid  internships offered by the SCA.
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Announcements Due date for today’s PLQ will be extended  until Wednesday Please check MasteringBio for the PLQs  and homeworks
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An example in one patient M. tuberculosis EVOLUTION OF DRUG RESISTANCE Lung tissue Bacteria with point mutation in  rpoB  gene 1.  M. tuberculosis   bacteria in  patient’s lungs causes  symptoms. 2. Antibiotic kills  most  M. tuberculosis http://www.pbs.org/wgbh/evolution/library/10/4/l_104_09.html
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An example in one patient 3. The mutant cells  proliferate. Patient becomes  sick again. 4. Antibiotic is 
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Oct5_NS2 -...

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