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BIS101-001 Practice Midterm 1

BIS101-001 Practice Midterm 1 - BIS 101-001(Chan Practice...

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BIS 101-001 (Chan) Name: ______________________________ Practice Midterm 1 Last, First ID #:_______________________________ BIS 101-001 – PRACTICE MIDTERM I I STRONGLY RECOMMEND TRYING TO DO THE EXAM BEFORE YOU LOOK AT THE KEY! This exam has a total of 100 points. READ THE QUESTIONS CAREFULLY BEFORE YOU ANSWER.  SHOW ALL WORK TO GET FULL CREDIT.   Please sign your name on  the score sheet.  This exam has ten pages including this cover page and the  score sheet HONOR CODE: My signature below affirms that I wrote this exam in the spirit of the honor system of the University of California, Davis. I neither received nor furnished any “help” during the exam, nor did I use any unauthorized references. Signature: ______________________________________________________ Good luck Authorization for Public Distribution of Graded Examination I, ______________________________________, ID# _______________________
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authorize that after this exam is graded, it can be placed in a holding bin, labeled BIS 101- 01, on the first floor of Briggs Hall.
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1. You have mutations in seven different genes ( E, N, Z, B, A, W, D ) and performed a number of two-point crosses to construct a genetic map. The data, in map units, are given below. E - N 6 N - W 14 Z - W 2 B - A 3 E - W 8 N - E 6 Z - A 50 B - D 11 E - Z 10 N - A 50 Z - D 50 D - A 8 N - D 50 Z - B 50 N - B 50 A. (5 pts) Draw a line diagram illustrating the genetic map. Include the distance between each adjacent pair of genes. B. (4 pts) How many chromosomes are involved? Can this question be answered with certainty? Explain your reasoning. 2. Coat color in cattle is determined by the S locus, which can have different alleles. S produces a band of white around the animal. sh produces a pattern of regular spots. sc produces a uniform color, and s produces large, irregular shaped spots. These 4 alleles form a hierarchy in their dominance (a > b means a dominant to b): S > sh > sc > s . Your uncle Herb is a cattle breeder, and he likes cattle with regular spots, because they sell at a higher price. He wants to purchase a bull that is homozygous for the allele determining regular spots and asks you for help.
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