University of florida bsc2010 biology 1 practice exam 2 solutions

May 6th, 2015
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University of florida bsc2010 biology 1 practice exam2 solutions

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DO NOT OPEN THIS EXAM UNTIL YOU ARE TOLD TO BEGIN.BSC 2010 Exam 2, Version ASummer 2011NAME: ______________________________________________________________________________________________________INSTRUCTIONS: With a #2 pencil, complete your scantron with your name, UF ID, section (7252), and exam version. After you are allowed to begin the exam, choose the best response for each question and fill in the corresponding bubble on your scantron form. Each question is worth 3 points.WHEN YOU ARE FINISHED: Turn in your scantron AND paper exam to a proctor at the front of the room. Have your ID ready. Exit out the doors at the front of the lecture hall. An exam key will be available online within one week.1. Jose and Karen have three boys and are in their mid-30s when Jose gets diagnosed with Huntington's disease, which is caused by a dominant allele. During genetic counseling, they learn that he is heterozygous, while Karen will never develop the disease. What is the chance that at least two of their sons will develop Huntingtons?A) cannot be determined from the information givenB) 25%C) 50%D) 75% E) 100%Solution: Hh x hh so 50% chance of having a child with Huntingtons (for each childhood) 0.5 x 0.5 = chance of having 2 children w Huntingtons+ 0.5 x 0.5 x 0.5 = chance of having 3 children w Huntingtons0.375 = not a choice so everyone who put C,D, or E got 3 points for this question (if you p

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