28. In Study 4, the initial values of p were:
Answer and Explanation
Your Answer is
Correct Answer is H
Explanation
Look at figure 4, when the abscissa is 0, the ordinate p corresponding to the five curves are 0.7, 0.75, 0.8, 0.85, and 0.9
Passage VI
A student performed 4 computer simulation studies to model the change at a gene in a population. For each study, the following rules applied:
• The gene has 2 alleles (possible forms): A and a.
• Each organism has 2 copies of the gene.
• Thus, there are 3 possible genotypes (allele combinations for the gene): AA, Aa, and aa.
• Different genotypes may have different fitnesses (the relative number of alleles per individual a genotype contributes to the next generation).
• The fitnesses of Genotypes AA, Aa, and aa are represented by W(AA), W(Aa), and W(aa), respectively.
• p = the proportion of the alleles that are in Form A.
• Changes in p are due to differences in the fitnesses of the genotypes.
• Time is measured in generations.
Study 1
Three simulations were done. In each, W(AA) = W(Aa) > W(aa), and the initial p = 0.1. See Figure 1.
Study 2
Three simulations were done. In each, W(AA) = W(Aa) < W(aa), and the initial p = 0.9. See Figure 2.
Study 3
Five simulations were performed. In each, W(AA) = 0.8; W(Aa)= 1.0; and W(aa) = 0.6, and the initial p varied. See Figure 3.
Study 4
Five simulations were performed. In each, W(AA) = 0.625; W(Aa)= 0.5; and W(aa) = 1.0, and the initial p varied. See Figure 4.
