Essentials of Genetics Study Set 1
Quiz 14 :
Gene Mutation, Dna Repair, and Transposition
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Q11 Q11 Q11
Barbara McClintock discovered mobile elements in corn by analyzing the genetic behavior of two elements, Ds and A c. The interplay between these two elements has become one of the most interesting stories of discovery in the field of genetics. How do Ds and Ac interact?
Q16 Q16 Q16
Three major types of RNAs are mRNA, rRNA, and tRNA. For each of the conditions below, predict the consequences in terms of the population of proteins being synthesized in a particular cell. What qualitative and quantitative changes, if any, are expected in the individual protein involved (if one is involved) and in the population of proteins produced in that cell? a() A frameshift mutation in mRNA. The condition is heterozygous in the involved cell. b() A deletion (homozygous) that removes approximately half of the rRNA genes.
Q24 Q24 Q24
Some mutagens cause genetic changes that can be "corrected" by reexposing cells to the same mutagen. Other mutagens do not behave in this way. Provide one example of each of these two types of agents and describe the mutational changes caused in DNA. Explain why some mutagens behave in one way, whereas others do not.
Q28 Q28 Q28
Assuming one mutational event in a gene, on average, which of the following mutagens or mutational conditions would be expected to cause the most damage to a protein synthesized by such a mutagenized gene: 5 -bromouracil, 2 -amino purine, ethylmethane sulfonate, or frameshift?