Practice%201%20with%20Key

Practice%201%20with%20Key - Name_Student ID#_ Bio 50 Exam I...

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Name_____________________________Student ID#____________________________ Bio 50 Exam I 80 total points 1 Signature for Honor Code:_____________________________ Part I Multiple Choice (12 points total; 2 each) 1. In a pea plant that is heterozygous for seed color, what proportion of gametes will carry the recessive allele? A) 1 B) 1/4 C) 1/2 D) 3/4 E) 1/3 2. During interphase of the cell cycle, mitosis or meiosis, A) DNA recombines B) sister chromatids move to opposite poles C) the nuclear membrane disappears D) DNA content doubles E) chiasmata form 3. For a single trait, the offspring of true-breeding parents may A) be a blend of both parental phenotypes. B) be exactly alike. C) resemble one parent only. D) both a and b E) all of the above 4. _______ begins when the two chromatids separate at their centromeres. A) Anaphase B) Prophase C) Metaphase D) Interphase E) Telophase 5. How many phenotypic classes are possible from a self cross of a trihybrid in which the genes involved show complete dominance? A) 20 B) 8 C) 2 D) 4 E) 16
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Name_____________________________Student ID#____________________________ Bio 50 Exam I 80 total points 2 6. Individuals that are heterozygous for a particular trait have A) multiple copies of the gene. B) two identical copies of the gene. C) two different alleles of the gene. D) two different genes responsible for the trait. 7. (14 total points) You have been given 4 haploid mutant yeast strains that fail to grow on media lacking proline (an amino acid), but grow just fine on media containing proline. These auxotrophic mutants are designated pro1, pro2, pro3, pro4 . You determine that these 4 mutations are recessive by making pro/+ diploids, which grow with or without proline in the medium. You then make the following diploid yeast strains with each of your pro mutants and test them for growth on media plus or minus proline. Your results are shown below. Growth on medium lacking proline
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This note was uploaded on 04/02/2008 for the course BIOL 50 taught by Professor Staff during the Spring '08 term at UNC.

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Practice%201%20with%20Key - Name_Student ID#_ Bio 50 Exam I...

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