Aa 100 aa 200 aa 30 therefore the allele a is a a

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AA = 100 Aa = 200 aa = 30. Therefore the allele “a” is a: A. null allele B. semi-lethal allele C. gain of function allele D. all of the above E. none of the above
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30.Two alleles of a gene are B and b. The allele “B” confers a Big teeth phenotype whereas the recessive “b” allele shows normal teeth. You cross two heterozygous parents Bb both with big teeth to obtain progeny in the following numbers for each genotype. BB = 0 Bb = 200 bb = 100. Therefore the allele “B” is a: A. semi-lethal allele B. lethal allele C. gain of function allele D. conditional lethal allele E. none of the above 31. Two genes A and B work redundantly (either one is sufficient) to convert the round tail of the bird into a fork shape. Alleles A and B represent the functional copies of each gene whereas allele a and b represent the non-functional copies of each gene. round tail fork tail If you cross two individuals with the genotype AaBb what is the ratio of the offspring showing fork tail to round tail. A. fork: round is 9:7 B. fork : round is 7:9 C. fork : round is 15:1 D. fork : round is 1:15 E. None of the above Gene A Gene B O R
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32. The example mentioned above represents the following form of gene interaction: A. recessive epistasis B. dominant epistasis C. complementation epistasis D. duplicate gene action E. suppression 33. For a quantitative trait observed in the F2 generation, the number of individuals showing one of the extreme phenotypes was 11 out of a total of 704 F2 progeny. Therefore the expected number of discrete phenotypic categories assuming low environmental influence is : A. 3 B. 5 C. 7 D. 9 E. 33 Use the information below to answer the next three questions: In a species of tree, seed color is determined by four independently assorting genes: A, B, C, D. The recessive alleles of each of these genes produce abnormal enzymes that cannot catalyze a reaction in the biosynthetic pathway for seed pigment. This pathway is diagrammed as follows: When both red and blue pigments are present, the seeds are purple. Trees with the genotypes AaBbCcDd and AaBbCcdd were crossed. White precursor yellow Orange red blue A B C D
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34.What was the color of the seeds from which the two parents whose genotypes are given above derived from? A. red and white B. blue and white C. purple and red D. blue and purple E. orange and purple 35.What proportion of the offspring from the cross will have white seeds? A. 1/2 B. 1/4 C. 1/8 D. 1/16 E. none of the above 36. The relative proportions of the red, white, blue offspring from the cross will be _____________________________ . A. 1:8:28 B. 27:32:9 C. 32:27:32 D. 28: 1: 8 E. none of the above
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Use the description below to answer the next two questions: 37. Genotype Phenotypes Males Females SS scurs scurs Ss scurs no scurs (hornless) ss no scurs no scurs The above genotypes show the respective phenotypes. If two heterozygous parents both having genotype Ss are crossed to one another what is the probability that an offspring would not grow scurs? A. 30 % B. 50% C. 100% D. 80% E. 75% 38. In the above case, the probability that a male offspring will grow scurs: A. 30 % B. 50% C. 100% D. 80% E. 75%
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  • Fall '15
  • Gene B, Zygosity, Sex linkage

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