Question

5. Jack Feldon has hypothesized that these species descended from a common ancestor via dispersal. Specifically, he proposes that the original species was confined to the western side of the mountains. One dispersal event brought individuals around the northern end of the mountains; the river prevented them from dispersing farther south. Some time later, a second dispersal event brought individuals around the southern end of the mountains; dispersal of these individuals was also stopped by the river. If his hypothesis is correct, phylogenetic analysis should reveal that a. Species A and B are each other's closest relatives b. Species B and C are each other's closest relatives. c. Species A and C are each other's closest relatives d. All three species are equally closely related You must justify your answer to receive credit! 6. Jill Uphill has hypothesized that these three species arose via vicariance. Specifically, she proposes that the area was originally occupied by a single species. Its range was split first by the mountain range. Later, the river formed, separating populations on the easterrm side of the mountains. If her hypothesis is correct, phylogenetic analysis should reveal that a. Species A and C are each other's closest relatives b. Species B and A are each other's closest relatives. c. All three species are equally closely related d. Species B and C are each other's closest relatives. You must justify your answer to receive credit N A

Answer 1

5: C: A and C are closely related

According to jack, species A and C are separated from each other recently and therefore must be closely related to each other. A and B must have accumulated variations with time and are not as closely related to each other as the recently separated species A and C are.

6: D: B and C are each other's closest relatives.

According to Jill, species B and C are separated from each other recently and therefore must be closely related to each other.