2007Exam3

2007Exam3 - BI206/282 Exam 3 May 3 2007 `YOUR NAME YOUR TF's NAME Page 1 Form 0 THIS IS EXAM FORM"O Remember to fill out your computer form

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BI206/282 – Exam 3 Page 1 May 3, 2007 Form 0 `YOUR NAME:_______________________ YOUR TF s NAME: ________________________ THIS IS EXAM FORM “O” Remember to fill out your computer form properly. Please include: a) Name (Last Name First name) omit middle initials b) ID number c) Course Code Fill in “Special Code” Box 0 as 0 for BI206 or 1 for BI282 d) Form Code Fill in “Special Code” Box 1 as 0 for Form 0 e) TF Code Fill in “Special Code” Box 2 to indicate your TF: Paige Bass – 0 Bianca Heinrich – 1 Larissa Jarzylo – 2 Steven Mullenbrock – 3 Be sure that you have answered 34 questions and that you have given one answer only per question. For each question only one answer is correct. So please choose the best answer from the ones provided. Please write your name on this booklet. Exam booklets will be collected at the end of the exam, but you will have the opportunity to see you exam booklet and score sheet at a later date. Grades will be posted on the Student Link. Prior to completing this exam, please read the following statement and sign the top of your scantron. “I pledge that I have neither given nor received unauthorized assistance on this exam. I understand if I am charged with cheating, my name will be submitted to the CAS Dean for disciplinary action.”
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Page 2 May 3, 2007 Form 0 1. The diagram below shows a map of the wild-type Drosophila X chromosome. Euchromatic regions are shown in black and heterochromatic regions (including the centromere) are in gray. Also shown are the locations of two genes, white ( w + ) and roughest ( rst ). Mutations in cause white eyes instead of the normal red eyes; mutations in cause rough eyes instead of the normal smooth appearance. You have identified an inversion on the X chromosome that inverts the region between the arrows. While most flies homozygous for the inversion have normal eyes, some flies develop eyes that show white patches in the eye. In addition, some of the white patches are rough. Which of the following statements is consistent with this phenomenon in relation to the observations made above? I. Some sectors will be found that are rough, but that still show the wild-type red color II. DNA isolated from the white patches will contain mutations in the gene III. Heterchromatin has likely invaded the neighboring euchromatin and silenced transcription of the gene. A. I B. II C. III D. I and III E. all of the above 2. X-inactivation D. sex-linkage E. non-disjunction
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This note was uploaded on 05/18/2008 for the course BI 206 taught by Professor Celenza during the Spring '08 term at BU.

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2007Exam3 - BI206/282 Exam 3 May 3 2007 `YOUR NAME YOUR TF's NAME Page 1 Form 0 THIS IS EXAM FORM"O Remember to fill out your computer form

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