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10 Nov 2019
QUESTION 1 Which of these statements is correct? Syntenic genes are located on the same chromosome. ObLinked genes are always syntenic. O c. You cannot always predict the relative genetic distance from their physical distance on a chromosome. O d- All of the above. QUESTION 2 What is theeenetic distance between two linked genes if the recombination frequency is 0.32? ?. 32 ?? b. 3.2 ?? ? ?. 0.32 ?? o d. Not enough information is provided to answer this question. QUESTION 3 What statement best explains the distortion in Mendelian ratios observed by Bateson & Punnett in 1905? Reminder: they found an overrepresentation of F2 offspring showing both dominant or recessive phenotypes, and an underrepresentation of offspring displaying one dominant and one recessive phenotype) Human error: they should have been more careful about their experimental setup. O b. Gene linkage: Genes for flower color and pollen shape are physically close on the same chromosome, leading to a breakdown in the independent assortment of the alleles for these traits Chromosome crossover: Homologous recombination of two chromatids during melosis caused the alleles to shuffle, resulting in a breakdown of the independent assortment of the alleles for those genes O d. Random variation: No two situations are alike. In finite populations, you are going to get some variation across a mean. QUESTION 4 Researchers investigating the genome of the red imported fire ant, Solenopsis invicta, discovered that two genes are located about 100 base pairs apart on the same chromosome. They also found that the chromosome in question is undergoing no recombination at all. What is the relative genetic distance between those genes? ? ?, 100 ?? b. 0 ?? O 10 cM O d. 50 CM QUESTION 5 The two genes Fand G, code for body size and aggressiveness, respectively. The Fallele codes for a larger body size, and is dominant over fallele that codes for a smaller body size. The G allele codes for aggressive behavior, and is dominant over g allele that codes for docile behavior. You perform a Mendelian dihybrid cross (NOT a test cross) on these traits. If there is no recombination between these genes (recombination frequency 0.00), what ratio should you see phenotypes in in the offspring?(note that the parent generation was made up of large aggressive ants and small docile ants.) 3.9 large aggressive:3 large docile: 3 small aggressive: 1 small docile b1 large aggressive: 1 large docile:1 small aggressive: 1 small docile 12 large aggressive:4 small docile (.e. 3 large aggressive :1 small docile) O d. None of the above. QUESTION 6 when determining the relative genetic distance between two genes, why is dihybrid back-cross preferable over traditional dihybrid cross? 9:3:3:1 phenotypic ratio is easier to work with than 1:1:1:1 rato. Genotypes of the offspring can be determined based on their phenotype Unlike the traditional dihybrid cross, dihybrid back-cross produces all possible combinations of genotypes d All of the above
QUESTION 1 Which of these statements is correct? Syntenic genes are located on the same chromosome. ObLinked genes are always syntenic. O c. You cannot always predict the relative genetic distance from their physical distance on a chromosome. O d- All of the above. QUESTION 2 What is theeenetic distance between two linked genes if the recombination frequency is 0.32? ?. 32 ?? b. 3.2 ?? ? ?. 0.32 ?? o d. Not enough information is provided to answer this question. QUESTION 3 What statement best explains the distortion in Mendelian ratios observed by Bateson & Punnett in 1905? Reminder: they found an overrepresentation of F2 offspring showing both dominant or recessive phenotypes, and an underrepresentation of offspring displaying one dominant and one recessive phenotype) Human error: they should have been more careful about their experimental setup. O b. Gene linkage: Genes for flower color and pollen shape are physically close on the same chromosome, leading to a breakdown in the independent assortment of the alleles for these traits Chromosome crossover: Homologous recombination of two chromatids during melosis caused the alleles to shuffle, resulting in a breakdown of the independent assortment of the alleles for those genes O d. Random variation: No two situations are alike. In finite populations, you are going to get some variation across a mean. QUESTION 4 Researchers investigating the genome of the red imported fire ant, Solenopsis invicta, discovered that two genes are located about 100 base pairs apart on the same chromosome. They also found that the chromosome in question is undergoing no recombination at all. What is the relative genetic distance between those genes? ? ?, 100 ?? b. 0 ?? O 10 cM O d. 50 CM QUESTION 5 The two genes Fand G, code for body size and aggressiveness, respectively. The Fallele codes for a larger body size, and is dominant over fallele that codes for a smaller body size. The G allele codes for aggressive behavior, and is dominant over g allele that codes for docile behavior. You perform a Mendelian dihybrid cross (NOT a test cross) on these traits. If there is no recombination between these genes (recombination frequency 0.00), what ratio should you see phenotypes in in the offspring?(note that the parent generation was made up of large aggressive ants and small docile ants.) 3.9 large aggressive:3 large docile: 3 small aggressive: 1 small docile b1 large aggressive: 1 large docile:1 small aggressive: 1 small docile 12 large aggressive:4 small docile (.e. 3 large aggressive :1 small docile) O d. None of the above. QUESTION 6 when determining the relative genetic distance between two genes, why is dihybrid back-cross preferable over traditional dihybrid cross? 9:3:3:1 phenotypic ratio is easier to work with than 1:1:1:1 rato. Genotypes of the offspring can be determined based on their phenotype Unlike the traditional dihybrid cross, dihybrid back-cross produces all possible combinations of genotypes d All of the above
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