Chapter 23 - Practice Set
Natural selection ________. - ANS-can indirectly favor development of prezygotic isolating
mechanisms through reinforcement
Tetraploid individuals arise in one part of the range of a species does not favor allopatric
speciation. True or False - ANS-True
Speciation rates in flowering plants are ________. - ANS-faster when the number of different
pollinating insects is low
Allopolyploids are hybrid plants that result from the mating of two closely related species. True
or False - ANS-True
It is difficult to apply the biological species concept to groups of organisms that ________. -
ANS-are asexual and exist only in the fossil record
When two populations that were once isolated come in contact, if the hybrids are unfit,
reinforcement of prezygotic barriers would be disfavored. True or False - ANS-False
If allopatric speciation is the most prevalent mode of speciation, what do you predict about the
geographic distributions of many closely related species? - ANS-Species that arise in allopatry
initially occur in separate, but usually adjacent, ranges. Therefore we would expect many
closely related species to exhibit this same pattern. The ranges of highly mobile species are
more likely to change over time, so the pattern should be strongest among relatively sedentary
species.
Two species of narrowmouth frogs in the United States have mating calls that differ more in their
region of sympatry than in those parts of their ranges that do not overlap. If this difference in
their vocalizations has the function of preventing hybridization between the two species, it is an
example of ________. - ANS-reinforcement
Which of the following is not a suggested reason for the adaptive radiation of silverswords on
the Hawaiian archipelago?
- Water is an effective barrier for many organisms
- Because islands are small compared with mainland areas, more species would be expected
to develop there
- competition is frequently reduced on islands
- more ecological opportunities exist on islands that have not been colonized by many species -
ANS-Because islands are small compared with mainland areas, more species would be
expected to develop there.
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