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midterm_i_ssi_08_version_b_key

midterm_i_ssi_08_version_b_key - BIS 101(Waddell Summer...

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BIS 101 (Waddell) Name:________________________ Summer 2008 Last, First Version B ID #:_________________________ BIS-101 MIDTERM I This exam has a total of 150 points. READ EACH QUESTION CAREFULLY BEFORE YOU ANSWER. SHOW ALL YOUR WORK TO GET FULL CREDIT. Please sign your name below and on the score sheet. This exam has 9 questions and is 12 pages including the cover page and 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:____________________________ Authorization for Public Distribution of Graded Examination I, _____________________________, ID#_________________________, authorize this exam to be placed in a holding bin following grading. The bins will be labeled BIS 101/Waddell, on the first floor of Briggs Hall.
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BIS 101 Name:________________________ Summer 2008 Last, First First Midterm Exam Question Points 1 ________ 2 ________ 3 ________ 4 ________ 5 ________ 6 ________ 7 ________ 8 ________ 9 ________ Total ________
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1) In an organism of 2n = 62 and 6 picograms of DNA in each nucleus in G1 of the cell cycle: a) How many chromatids will be present in prophase of mitosis? (2 Points) 124 Chromatids b) How many different chromosomes will be present at metaphase II of meiosis? (2 Points) 31 different chromosomes c) How many chromatids will be present at prophase I of meiosis? (2 Points) 124 Chromatids d) What is the amount of DNA in each daughter nucleus that results from mitosis? (2 Points) 6 picograms e) What is the amount of DNA in each daughter nucleus following meiosis I? (2 Points) 6 picograms
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2) You have decided to make a cross between two pea plants that are heterozygous for five of the characters that Mendel studied. Your heterozygous pea plants have the following phenotype: purple flowers (white is recessive), yellow peas (green is recessive), round peas (wrinkled is recessive), long stems (short stems are recessive), and axial flowers (terminal flowers are recessive). Remember, for each character, there are only two alleles per locus and one allele is completely dominant to the other. a) Write the genotypes of the individuals in the above stated cross. Be sure to use correct symbols for the dominant and recessive alleles. (4 Points) Cross: Pp Yy Rr Ll Aa x Pp Yy Rr Ll Aa b) How many phenotypic classes are expected among the progeny of this cross? Show your work. (4 Points) 2 5 = 2 x 2 x 2 x 2 x 2 = 32 Phenotypic Classes c) What proportion of the progeny would be predicted to be homozygous dominant at all five loci? Show your work. (4 Points) Genotype of progeny described is: PP YY RR LL AA Treat each locus as a monohybrid cross and, since each gene is unlinked, getting a given combination of alleles at one locus is completely independent of getting a given allele combination at another of these loci and thus: ¼ chance of PP and ¼ chance YY and ¼ chance RR and ¼ chance LL and ¼ chance AA.
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