Exam 22: The Origin of Species

The following questions refer to the evolutionary tree in Figure 22.4,whose horizontal axis represents time (present time is on the far right)and whose vertical axis represents morphological change. Figure 22.4 -Which of these five species is the extant (that is,not extinct)species that is most closely related to species X,and why is this so?

The following questions refer to the evolutionary tree in Figure 22.4,whose horizontal axis represents time (present time is on the far right)and whose vertical axis represents morphological change. Figure 22.4 -Which of these five species originated earliest and appeared suddenly in the fossil record?

Figure 22.6 A hybrid zone is indicated by plotting the frequency of the yellow-belly allele across the distance from the center of the hybrid zone.What is the gene frequency of the fire-bellied toad 20 km from the hybrid zone center?

Which habitats should harbor snapping shrimp species with the greatest degree of genetic divergence from each other?

Rocky Mountain juniper (Juniperus scopulorum)and one-seeded juniper (J.monosperma)have overlapping ranges.If pollen grains (which contain sperm cells)from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells)of the other species,then which of these terms are applicable? 1)sympatric species 2)prezygotic isolation 3)postzygotic isolation 4)allopatric species 5)habitat isolation 6)reduced hybrid fertility

The following questions refer to the evolutionary tree in Figure 22.4,whose horizontal axis represents time (present time is on the far right)and whose vertical axis represents morphological change. Figure 22.4 -Which conclusion can be drawn from this evolutionary tree?

The Panama Canal was completed in 1914,and its depth is about 50 feet.After 1914,snapping shrimp species from which habitats should be most likely to form hybrids as the result of the canal?

Which of the following statements is most accurate?

Please use the following information to answer the questions below. On the Bahamian island of Andros,mosquitofish populations live in various now-isolated freshwater ponds that were once united.Currently,some predator-rich ponds have mosquitofish that can swim in short,fast bursts;other predator-poor ponds have mosquitofish that can swim continuously for a long time.When placed together in the same body of water,the two kinds of female mosquitofish exhibit exclusive breeding preferences. -Which type of reproductive isolation operates to keep the mosquitofish isolated,even when fish from different ponds are reunited in the same body of water?

Which of the following statements about species,as defined by the biological species concept,is (are)correct? I.Biological species are defined by reproductive isolation. II.Biological species are the models used for grouping extinct forms of life. III.The biological species is the largest unit of population in which successful interbreeding is possible.

Which one of the following choices describes an advantage of the biological species concept?

Males of different species of the fruit fly Drosophila that live in the same parts of the Hawaiian Islands have different elaborate courtship rituals.These rituals involve fighting other males and making stylized movements that attract females.What type of reproductive isolation does this represent?

Which mechanism would reverse speciation?

Figure 22.7 -Two models for the speed of speciation are based on patterns in the fossil record.Which of the following statements describes the gradual model of evolution?

Plant species A has a diploid number of 12.Plant species B has a diploid number of 16.A new species,C,arises as an allopolyploid from A and B.The diploid number for species C would probably be