UT Knoxville BIOL 130 - Exam 2 Key (7 pages)

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Exam 2 Key



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Exam 2 Key

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Pages:
7
School:
University of Tennessee
Course:
Biol 130 - Biodiversity

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Page 1 Biology 130 Fall 2012 Second exam An exam is an opportunity where your preparation meets my challenge Selection operates directly on and indirectly on A genotype if phenotype is genetically determined phenotype B genotype if phenotype is not genetically determined phenotype C phenotype genotype if phenotype is genetically determined D phenotype genotype if phenotype is not genetically determined E genotype genotype if phenotype is genetically determined In a certain population 40 of every 1 000 births results in an individual that suffers from cystic fibrosis What is the allele frequency for the recessive allele that causes cystic fibrosis A 0 004 B 0 02 C 0 2 D 0 4 E 0 8 In a certain population the allele causing sickle cell anemia has a frequency of 0 2 If the population is in genetic equilibrium for this allele what fraction of the population would have malarial resistance Recall that the sickle allele is recessive for red blood cell shape and dominant for malaria resistance A 0 04 B 0 08 C 0 16 D 0 32 E 0 36 The Hardy Weinberg principle is useful because A it explains the existence of variation in populations B it proves that Mendel was correct for populations C it describes most populations D it explains the existence of so many species E it identifies those factors that can change allele or genotype frequencies In a certain population 4 alleles are segregating at a particular locus with the following allele frequencies AM 0 3 AT 0 2 AP 0 1 AK 0 4 What is the expected frequency of AM AK heterozygotes A 0 12 B 0 24 C 0 48 D 0 7 E cannot be determined from the data Due to various causes including hunting drainage of wetlands and DDT poisoning the population size of whooping cranes was reduced to about a dozen during the 1970s The population size has since rebounded and there are now hundreds of whooping cranes Which of the following would you not expect to see in whooping cranes A Very low levels of genetic variation B Very few heterozygous individuals C



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