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NAME_______________________________ Chapter 24 Quiz 1) Two species of frogs occasionally mate, but the embryos do not complete development. What type of barrier isolates these gene pools a) gametic isolation b) prezygotic barrier c) hybrid breakdown d) reduced hybrid viability e) reduced hybrid fertility 2) A horse (2n = 64) and a donkey (2n = 62) can mate and produce a mule. How many chromosomes would there be in a mule’s cells? a) 31 b) 62 c) 63 d) 64 e) 126 3) Allopatric speciation is more likely to occur when an isolated population: a) is large and thus has more genetic variation b) is reintroduced to its original homeland c) is small and exposed to different selection pressures in its new habitat d) inhabits an island close to its parent species’ mainland e) all of the above contribute to allopatric speciation 4) A tetraploid plant species (with four identical sets of chromosomes) is probably the result of a) allopolyploidy b) autopolyploidy c) prezygotic barrier d) allopatric speciation e) a and c 5) Which of the following would not contribute to allopatric speciation a) geographic separation b) genetic drift c) gene flow d) different selection pressures e) founder effect 6) Which of the following is the best description of punctuated equilibria? a) long periods of stasis are punctuated by episodes of relatively rapid speciation and change b) the equilibrium of separate species may be punctuated by gene flow within hybrid zones c) most rapid speciation events involve polyploidy in plants; speciation in animals is a much more gradual process d) rapid environmental changes produce rapid speciation events. Gradual environmental changes results in gradual speciation events. Speciation does not occur is the environment remains constant e) in the framework of geologic time period, speciation events occur rapidly and the equilibrium of species is punctuated by frequent extinctions Use this key for 7-11 a) b) c) d) e) Bottleneck Adaptive radiation Directional reproduction Sexual reproduction Sympatric speciation **use each only once 7) Because of human predation, the sizes of and genetic variation in populations of most whale species are declining 8) Progeny possess new combination of alleles every generation 9) Many strains of Mycobacterium tuberculosis, the bacterium that causes tuberculosis, are resistant to standard drug therapy 10) There are more than 750,000 names species of insects inhabiting a wide range or habitats 11) A recently introduced species of seed-eating birds occupies an island where small and large seeds are available. Beak size in the bird population varies from small to large, allowing some birds to be more successful at eating small seeds, while others are more successful at eating large seeds. Birds with intermediate beak size must exert additional effort to eat seeds.