UNIT III Practice Exam _1 & revised KEY

UNIT III Practice Exam _1 & revised KEY - UNIT III...

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UNIT III PRACTICE EXAM #1 BSC 2011 FALL 2007 Before you begin, please write your name (last name first) and social security number on the computerized score sheet. Mark in the corresponding bubbles under these. Fill in the Form (A or B), instructor (Spears), and course (BCS 2011-03) lines. Select the best answer to each question. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1. Which is true of vestigial traits? A. they have the same function in different species B. the are evidence of extinction C. they are caused by the environment rather than genetics D. they have no current function E. none of these is true of vestigial traits 3. In a human population that is in Hardy-Weinberg equilibrium, the frequency of the I A allele is 0.5 and the frequency of the i allele is 0.3. All possible ABO blood groups are present in the population. What is the frequency of individuals with Type B blood? A. 0.55 B. 0.25 C. 0.16 D. 0.09 E. 0.05 5. Which of the following is not an essential element of evolution by natural selection? A. more offspring are produced than can survive to become parents themselves B. individuals with some traits produce more offspring than others C. variation among individuals is caused by genetic differences D. there is variation among individuals of a species E. all of these are essential elements of evolution by natural selection 6. In a population that has just been reduced to a small size by a natural disaster (i.e., no longer in Hardy- Weinberg equilibrium), you find a total of 6 survivors. Four have the genotype AA, 1 is Aa, and 1 is aa. What is the frequency of the A allele in this gene pool? A. 0.25 B. 0.40 C. 0.50 D. 0.60 E. 0.75 7. Which of the following would be most likely to cause genetic drift? A. a spontaneous change in chromosome number in a population B. movement of individuals from one population to another C. the production of more offspring by brighter colored individuals D. a tendency of individuals to prefer to mate with their relatives E. the initiation of a new population by a small number of individuals 8. In a population in Hardy-Weinberg equilibrium, 25% of the individuals express the recessive phenotype. What is the expected frequency of heterozygotes? A. 0.05 B. 0.10 C. 0.25 D. 0.50 E. 0.75
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9. The allele frequency at a flower color locus in a population of alpine plants changes when a landslide kills most of the individuals in the population. This is an example of _______. A. gene flow B. catastrophism C. a bottleneck effect D. Hardy-Weinberg equilibrium E. a founder effect Each of the phenomena listed below might (or might not) result in a violation of the assumptions required to maintain Hardy-Weinberg equilibrium. For each one, provide the letter for the Hardy-Weinberg assumption that it violates. Phenomenon
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UNIT III Practice Exam _1 & revised KEY - UNIT III...

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