exam bio - What is the probable cause of the current...

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What is the probable cause of the current increase in species extinctions? ( Biology and Society: The Sixth Mass Extinction ) Your Answer: asteroid Correct Answer: humans No. However, it is hypothesized that an asteroid has contributed to extinctions in the past. 2. Macroevolution includes __________. ( Macroevolution and the Diversity of Life ) Your Answer: increase in the number of species over time Correct. Macroevolution includes an increase in the number of species over time. 3. Bird guides once listed the myrtle warbler and Audubon's warbler as distinct species that lived side by side in parts of their ranges. However, recent books show them as eastern and western forms of a single species, the yellow-rumped warbler. Apparently, the myrtle warbler and Audubon's warbler __________. ( The Origin of Species ) Your Answer: successfully interbreed and produce fertile offspring Correct. That is the definition of biological species. 4. The biological species concept can be applied to organisms that __________. ( The Origin of Species ) Your Answer: interbreed sexually Correct. The biological species concept defines a species as a population or group of populations whose members have the potential to interbreed with each other in nature and produce viable, fertile offspring but who cannot produce viable, fertile offspring with members of other species. 5. Imagine a scenario in which part of a population of South American finches is blown by a storm onto an island offshore and manages to survive and reproduce there for a period of 10,000 years. After that period, a climate change results in lower sea levels and the reconnection of the island with the mainland. Members of the formerly isolated island finch population can now interact freely with members of the original mainland population. Which of the following observations would, by itself, lead you to conclude unequivocally that the island finch population had evolved into a distinct species? ( The Origin of Species )
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Your Answer: Individuals from the different populations feed on the same kinds of seeds in the same habitats and frequently direct courtship behavior toward members of the other population. Correct Answer: Individuals from the different populations sometimes mate with each other, but all of the resulting eggs are sterile. No. This suggests that speciation did not occur. 6. Three species of frogs— Rana pipiens , Rana clamitans , and Rana sylvatica — all mate in the same ponds, but they pair off correctly because they have different calls. This is a specific example of a _____ barrier, called _____. ( The Origin of Species ) Your Answer: prezygotic . .. temporal isolation Correct Answer: prezygotic barrier . .. behavioral isolation No. It is a prezygotic barrier, but the frogs may mate at the same time. 7.
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exam bio - What is the probable cause of the current...

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