Study_questions_week-1_13

The following summer the lake dried up but in the

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Unformatted text preview: The following summer the lake dried up but in the next spring before it refilled (the beginning of generation-2) all of the anhydrobiotic rotifer eggs produced from the previous year were collected and scored for color. 400 red and 600 green eggs were observed in this collection. 96) The Darwinian fitness of genotype-G was: a) 250 d) 4 b) 1 e) none of these answers c) 6 97) After one generation of natural selection, the change in the proportion (in the gene pool) of the allele coding for red egg color was: a) +50% d)-15% b)-50% e) none of these answers c) +15% 08) The relative fitness of genotype-G is: a) 2 d) 1.0 b) 0.5 e) none of these answers c) 0.33 99) Suppose that the same experiment was carried out in a different pond. In this pond, data was only collected for survival: the survival of genotype-B was 10% and that of genotype-R was 25%. The genotype in this lake that coded for the best "gene transport machine” is: a) Genotype-R d) Both genotype-R and Genotype-G b) Genotype-G e) Too little information to decide c) Neither genotype-R nor genotype-G 100) Suppose that the red pigment is energetically expensive to produce and that some of it leaches into the water, making the pond water slightly red. Red-colored pond water is also produced by another rare invertebrate (absent in most ponds) that is highly poisonous, and the presence of reddish water in a pond causes the major predator of rotifers (a wading bird) to avoid these ponds. In ponds where the R and G alleles are both present, the leached red pigment phenotype coded by the R allele would: a) Contribute to a relative fitness advantage of the R allele d) Obey Hamilton’s rule b) Contribute to a fecundity advantage of the R allele e) None of these answers c) Be an altruistic trait ________________________________________________________________________________________ Use the following information for the next 5 questions (until you see a solid line): Suppose that Jane Schmoe was trying to develop a vaccine against HIV-AIDS. She infected a cell line originally derived from green monkeys with human HIV virus and then collected the progeny virus and used these to infect naïve green monkey cells taken anew from the green monkey cell culture line. After 20 iterations of this process (i.e., 20 cell line “passages”) she infected human CD4 + Helper-T cells and found that the evolved vaccine virus could no longer bind to the CCR5 protein. Genomic analysis indicated that the virus had changed in no other way. Using the same procedure, but with a cell line originally collected from a gorilla (instead of a green monkey), she found that the evolved virus could no longer integrate its DNA copy of its chromosomes into the chromosomes CD4 + helper-T cells. Genomic analysis of this virus indicated that the it also had one other change (and only one) that would prevent translation of viral mRNA if it were produced....
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The following summer the lake dried up but in the next...

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