Suppose that males brood their mates eggs and that

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24. Suppose that males brood their mate’s eggs and that this brooding behavior is energetically taxing on the males, causing males to sometimes abandon their clutch of eggs. On average, smaller males are more likely to abandon their clutch of eggs, and larger males are more likely to be successful in obtaining a mate. If you found that large males with average brightness of their green wings had mating success equal to that of small males with very bright wings, then which sexual selection model is most likely responsible for the evolution of the bright green wings? A. sensory exploitation model B. sexy sons model C. sexual conflict model D. material benefits model E. good genes model 25. Suppose that green-winged babbler is a member of a clade of birds that lack head plumes (except for the green-winged babbler), including species closer to the clade’s root. Experiments show that female attraction to a head plume is a synapomorphy for the clade, but that female preference for this trait is similar in all species. This finding would best support the hypothesis that the head plume evolved via the: EEMB 2 Final Ivory Version: 0 Page: 7
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Use the following information for the next 4 questions (until you see a solid line): Suppose that Joe Schmo was trying to develop a vaccine against HIV-AIDS. He infected a cell line originally derived from chimps with human HIV virus and then collected the progeny virus and used these to infect naïve chimp cells taken anew from the chimp cell culture line. After 50 iterations of this process (i.e., 50 cell line “passages”) he infected human CD4 + Helper-T cells and found that the evolved vaccine virus could no longer translate its reverse transcriptase gene because the mRNA’s promotor no longer functioned properly in human CD4 + Helper-T cells. After 50 more passages through the chimp cell line, he found that the vaccine virus could not bind the CCR5 protein, and additional experiments showed that if this binding defect was corrected then the virus could not translate its reverse transcriptase gene in human CD4 + Helper-T cells 26. If you examined human Helper-T cells infected with the “50 passages” vaccine virus, you would NEVER find
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