Biol112-Exam1a-08 - version A(note this on your Scantron...

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version A (note this on your Scantron) your ID#:___ KEY-A _____ 90 total points possible Biol 112—General Biology II Exam 1 25 January 2008 There are 45 questions worth 2 points each. Choose the one best answer and circle the letter. You must use a ball point pen on this exam sheet; pencil is required for the Scantron form. Only Scantrons submitted with this exam document will be accepted and scored. 1. On which of the following did Linnaeus base his classification system? a. morphology and anatomy ! b. the genetics of the organisms c. the fossil record d. the organisms’ evolutionary relationships 2. In the Hardy-Weinberg theorem, p 2 represents the ________ in the gene pool. a. frequency of heterozygous dominants b. frequency of homozygous dominants ! c. frequency of homozygous recessives d. total alleles 3. Which of the following factors would not contribute to allopatric speciation? a. Gene flow between the two populations is extensive. ! b. The isolated population is exposed to different selection pressures than the ancestral one. c. The separated population is small, and genetic drift occurs. d. Different mutations begin to distinguish thje gene pools of the separated populations. 4. Which of the following statements about the evolution of the horse (based on horse fossils), is false ? a. The general trend seems to be increasing body size and reduction in number of toes. b. Horse evolution generally progresses toward some predetermined goal. ! c. There is a progression toward a grazing rather than browsing as a feeding strategy. d. all of the above (i.e. all are false) 5. Which of the following statements about speciation is correct ? a. Speciation is included within the concept of macroevolution. ! b. When reunited, two allopatric populations will interbreed. c. Natural selection chooses the reproductive barriers for populations. d. Prezygotic reproductive barriers usually evolve before postzygotic barriers. 1
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6. A hypothetical mutation in a squirrel population produces organisms with eight legs rather than four. Further, these mutant squirrels survive, successfully invade new habitats, and eventually give rise to a new species. The initial event giving rise to extra legs would be a good example of a. punctuated equilibrium. b. allometery. c. habitat selection. d. changes in homeotic genes. ! 7. According to the Hardy-Weinberg theorem, the frequencies of alleles in a population will remain constant if ___________ is the only process that affects the gene pool. a. mutation b. genetic drift c. sexual reproduction ! d. natural selection 8. Which of the following is not considered an intrinsic isolating mechanism? a. sterile offspring b. geographic isolation ! c.
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Biol112-Exam1a-08 - version A(note this on your Scantron...

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