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exam3-09key - name student ID Genetics L311 exam 3...

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name:_______________________ student ID:_____________________ Genetics L311 exam 3 November 20, 2009 Directions: Please read each question carefully. Answer questions as concisely as possible. Excessively long answers, particularly if they include any inaccuracies, may result in deduction of points. You may use the back of the pages as work sheets, but please write your answer in the space allotted. However, you must show all your work. Clearly define your genetic symbols. We will not make guesses as to what a particular symbol is intended to mean. Also, don’t assume that strains are true-breeding unless this is stated in the question. Finally, show all your work. Good luck. page 2 _______ (20 points possible) page 3 _______ (23 points possible) page 4 _______ (16 points possible) page 5 _______ (30 points possible) page 6 _______ (11 points possible) total _______ (of 100 points possible) 1
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name:_______________________ student ID:_____________________ 1. Short answers (2 points each, 20 points total) A. A bacterial cell that harbors a phage genome integrated within the bacterial genome is called a lysogen . B. In heteroplasmy , there is a mixture of mutant and wild type organelles, such as mitochondria. C. A genetic element that can exist either free in the cytoplasm or integrated into the chromosome is a(n) episome . D. Naturally occuring Xenopus laevis have 4 sets of chromosomes. They appear to be derived from two different species. If true, then Xenopus is an example of allopolyploidy . E. Aneuploidy is the situation where the chromosome number differs from normal by less than a full set. F. Gene therapy is the use of recombinant DNA technology to correct a human genetic disorder. G. Roberstonian translocation is a special type of rearrangement in which the two long arms of two acrocentric chromosomes fuse. One such rearrangement causes a high frequency of Down Syndrome. Please provide concise definitions of the following terms: H. merodiploid: a bacterial cell having two copies of a gene I. reporter transgene: fusion of a gene or its promoter to a gene that produces an easily detected product, like gfp.
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