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Sample final for - Name_KEY BIOLOGY 325H Genetics Spring 2006 Final Examination(160 points Before you do anything else please check to make certain

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Name ___ KEY ______________ BIOLOGY 325H Genetics Spring 2006 Final Examination (160 points) Before you do anything else , please: check to make certain that your copy of the exam is complete, i.e. 11 pages. print your name legibly in the space provided at the top of each page. _______________________________________________________ 1. . [15 pts] To isolate mutations on Chromosome 2, Nüsslein-Volhard and Wieschaus crossed mutagenized male flies with female flies that were heterozygous for a modified version of Chromosome 2 called a ‘balancer chromosome ‘. A. How does the balancer chromosome differ in structure from a naturally occurring Chromosome 2? The balancer chromosome contains a large inversion. B. A germ cell that is heterozygous for this balancer chromosome undergoes meiosis to produce four haploid cells. What would you expect to be the chromosomal makeup of these haploid cells? Meiosis will generate 4 haploid gametes. If there is no crossing over, 2 gametes will receive the normal chromosome and 2 will receive the balancer chromosome. If crossing over occurs between a normal chromatid and a balancer chromatid during Meiosis I, the resulting chromosomes will both have significant deletions. Gametes receiving these deleted chromosomes will not give rise to viable offspring.
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Name ___ KEY ______________ 2. [25 pts] A. What structural and behavioral adaptations are shared by respiratory organs that absorb O 2 from water (gills) and from air (lungs)? large respiratory surface area for gas exchange thin epithelium across which exchange takes place dense network of capillaries immediately beneath the respiratory surface ventilation, i.e. muscular movements that propel fresh O 2 -rich medium over the respiratory surface B. How does the structure of the heart differ between a fish and a mammal? The heart of a fish is composed of a single atrium and a single ventricle. The heart of a mammal is composed of two atria and two ventricles. C. How does the structure of the vascular system differ between a fish and a mammal? The vascular system of a fish is composed of a single circuit. Blood leaving the heart must pass sequentially through two capillary beds (gill + systemic) before returning to the heart. The vascular system of a mammal is composed of two separate circuits. The pulmonary circuit carries blood from the right ventricle to a capillary bed in the lungs, from whence it returns to the left atrium. The systemic circuit carries blood from the left ventricle to the systemic capillary bed, from whence it returns to the right atrium.
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Name ___ KEY ______________ D. Describe the sequence of cellular and molecular events by which a presynaptic action potential leads to an excitatory postsynaptic potential (EPSP) at the neuromuscular junction. Action potential depolarizes presynaptic axon terminal.
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This note was uploaded on 05/14/2008 for the course BIO 325H taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

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Sample final for - Name_KEY BIOLOGY 325H Genetics Spring 2006 Final Examination(160 points Before you do anything else please check to make certain

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