Practise Questions Jan. 2012 Key

Individual b population c community d ecosystem 10 a

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Unformatted text preview: n’t identical. e. Both C & E apply. 9. When measuring genetic variation, the appropriate size unit is: a. Individual b. Population c. Community d. ecosystem 10. A phenotype of an organism is: a. Its genetic constitution, which governs its traits b. Chronological expression of its genes c. Physical expression of its genotype d. Form it achieves as an adult 11. In a population, there are two alleles of the A gene (A1 & A2). You know that the frequency of the A1 allele is 0.4. Calculate the frequency of the other allele. A2 = 0.6 If A2 encodes a phenotype that is dominant to A1, what proportion of the population will show the A2 phenotype? 2pq+q2 = 2(0.4)(0.6) + (0.6)2 = 0.48 + 0.36 = 0.84 12. 7. In a population, there are two alleles of the A gene (A1 and A2). Genotypes of the A gene are found a the following frequencies: A1A1 = 0.54; A1A2 = 0.38; A2A2 = 0.08. What is the observed frequency of the A1 and A2 alleles, respectively? A. 0.73; 0.27 B. 0.54; 0.45 C. 0.63; 037 D. 0.485; 0.515 E. 0.392; 0.608 13. The Hardy–Weinberg principle of genetic equilibrium tells us what to expect when a sexually a. reproducing population is b. decreasing with each generation. c. increasing with each generation. d. migrating. e. evolving. f. not evolving. 14. In what sense does the Hardy-Weinberg principle act as a null hypothesis? a. It is the starting point of all evolutionary studies. b. It specifies the conditions that need to be controlled in an evolutionary study. c. It specifies what genotype frequencies should be, given measured allele frequencies. d. It specifies what should be observed if no evolution is currently occurring at a particular gene. 15. What changes DNA but has no impact upon the phenotype of an individual. a. beneficial mutations b. neutral mutations c. directed mutations d. chance mutations e. all of these 16. The source of new alleles in a population is a. natural selection. b. mutation. c. microevolution. d. adaptation. e. genetic drift. PRACTISE QUESTIONS BIOL 1001 W2012 Key 1...
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This test prep was uploaded on 02/20/2014 for the course BIOLOGY 1001 taught by Professor Tamarakelly during the Spring '13 term at York University.

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