BISC120_Exam1_Fall07_page4 - 9 When they were first sold...

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Unformatted text preview: 9. When they were first sold, aerosol insecticides were highly effective in killing flies and mosquitoes. Now. several decades later. a much smaller proportion of these insects die when sprayed. The reason fewer insects die when they are sprayed is that many mosquitoes today are descendants of mosquitoes with insecticide—resistant characteristics. K. mosquitoes are deliberately adapting themselves to this man-made change in the environment. )1. the original spraying has caused a permanent mutation. giving the insects genetic resistance to the spray. K none of the above. g. mosquitoes that survive spraying develop an immunity to the insecticide. 10. Two bird species that do not hybridize in nature readily hybridize in captivity and produce viable and fertile offspring. Which of the following is most likely to keep the gene pool of these two species separate in nature? X Gametic incompatibility K Conflicting courtship rituals- }5; Hybrid sterility @Different geographic ranges K Mechanical incompatibility [E 11. Two worms in the same class must aiso be grouped in the same 3K. order @phylum i) t arise >3. genus In a. family «15—_; it: species 12. Lake Victoria, in Africa, is home to a group of related fishes known as cichlids. Many of these fishes are similar in appearance but have different feeding habits. What is the best method for scientists to determine conclusively whether the fish are members of a o ulation that has a lot of variation or members of entirel different 5 ecies? . p p y p blaieglcai - @Observe the fish in their natural environment for possible instances of interbreeding leading to several generations of fertile offspring. Wsmdy the fossil record 4 —C. Compare DNA sequences, because the DNA of members of the same species should be identical. 13. Use comparative anatomy to discover homologous structures. E. All of these must be done to determine whether a single population or different species are present. ...
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