PEQ WEEK 4-6 QUESTIONS & ANSWERS RATED 100% CORRECT

A population of rodents, called population A, lived on a large landmass. One group of the population dispersed to a nearby island. Two million years later, the island population split into two smaller, equalsized populations when a river formed across the middle of the island. Now two new species, A1 and A2, have evolved on the island. They have replaced the population from which they were derived. Use the image to answer the question.Which diagram represents the phylogeny of the populations discussed in this scenario? A. diagram H B. diagram K The ancestral population is population A on the mainland. Then, over time, the group from that population that colonizes the island splits into two populations (A1 and A2) that are different from each other and from the colonizing population. Because A1 and A2 are more recent, they will be more closely related to each other than they are to the original population, making th - Answer-B. diagram K The ancestral population is population A on the mainland. Then, over time, the group from that population that colonizes the island splits into two populations (A1 and A2) that are different from each other and from the colonizing population. Because A1 and A2 are more recent, they will be more closely related to each other than they are to the original population, making them sister taxa on the phylogeny. Different species of fruit flies occupy each of the islands in the Hawaiian island chain, a group of volcanic islands that formed one after the other. One hypothesis for how the different fruit fly species formed is that, after each new island was formed, fruit flies from existing islands colonized it and subsequently diverged. If this hypothesis is correct, it would be an example of: A. peripatric speciation by vicariance B. allopatric speciation by vicariance. C. sympatric speciation by vicariance. D. sympatric speciation by dispersal. E. allopatric speciation by dispersal. -Sympatric or peripatric speciation did not occur in this case because the speciation events happened on multiple islands. The fly populations are separated by the water between the islands, so they occur in allopatry. The speciation event was not the result of vicariance because the formation of the island, through volcanic activity, did not d - Answer-E. allopatric speciation by dispersal. -Sympatric or peripatric speciation did not occur in this case because the speciation events happened on multiple islands. The fly populations are separated by the water between the islands, so they occur in allopatry. The speciation event was not the result of vicariance because the formation of the island, through volcanic activity, did not divide the original population into two.For reciprocal altruism to work, individuals must be able to: A. recognize one another and remember previous interactions. B. remember previous interactions. C. calculate the fitness value of individual interactions. D. recognize one another. E. recognize one another, remember previous interactions, and calculate the fitness value of individual interactions. - Answer-A. recognize one another and remember previous interactions. If a population is not in Hardy-Weinberg equilibrium, we can conclude that: A. nonrandom mating has occurred. B. natural selection has occurred. C. one of the assumptions of the Hardy-Weinberg equilibrium has been violated D. All of these choices are correct. E. evolution has occurred because one or more of the assumptions of the Hardy-Weinberg equilibrium has been violated. - Answer-E. evolution has occurred because one or more of the assumptions of the Hardy-Weinberg equilibrium has been violated. Imagine these genotype frequencies in a population: p2 = 0.49, 2pq = 0.42, q2 = 0.09. Now assume that there is nonrandom mating where individuals with one genotype will only mate with individuals that also have their genotype. Assume this pattern of mating goes on until the frequency of heterozygotes is effectively zero. In addition, there is also inbreeding depression such that individuals with the genotype represented by p2 die before they can reproduce. What will be the eventual frequency of allele q? A. 0.3 B. 1.0 C. 0.91 D. 0.49 E. 0.7 - Answer-B. 1.0