CU-Boulder PSYC 2841 - Practice Test 4 No Answers (6 pages)

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Practice Test 4 No Answers



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Practice Test 4 No Answers

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Pages:
6
School:
University of Colorado at Boulder
Course:
Psyc 2841 - Independent Study (Lower Division)

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MCDB 2150 Practice Test 4 1 Below is shown a complementation table from Neurospora mutants that cannot make the amino acid tryptophan 1 2 3 4 5 1 2 3 4 5 6 6 Given this information how many genes are involved in the synthesis of tryptophan A 1 B 2 C 3 D 4 E 5 3 You have the seeds from inbred tomato plants and seeds from genetically diverse tomatoes You grow both types of seeds in the same greenhouse measure the stem lengths and plot distribution curves as shown to the right The total variance in this distribution curve is due to genetic variance VG and environmental variance VE Looking at the 2 distribution curves for the genetically identical and genetically diverse plants which of the following statements is true A A VG and B VG B A VE and B VG C A VG and B VE D A VE and B VE 3 You find several additional mutant fly lines with lethal patterning defects which you maintain as heterozygotes You suspect that at least one of the mutant lines is the result of a mutation in a maternal effect gene while the other is the result of a mutation in a Hox gene Which of the following experiments and outcomes would allow you to determine which is the maternal effect mutant line A cross two heterozygotes together if the offspring are all dead it is the maternal effect mutation B cross two heterozygotes together if the offspring are all alive it is the maternal effect mutant C cross two heterozygotes together if of the offspring are dead it is the maternal effect mutant MCDB 2150 Practice Test 4 4 Hox genes as described in class give cells important positional information in all organisms One Hox gene Antp defines the T2 segment which normally produces wings in Drosophila Suppose you have 2 mutant flies One mutant has a loss of function Antp mutation and the other has a gain of function Antp mutation in which Antp is now expressed in the T3 segment in addition to the T2 segment What would you expect to see A no wings in both loss of function and gain of function mutants B wings on both the T2 and T3 segments in both loss of function and gain of function mutants C no wings in the loss of function wings on both the T2 and T3 segments in the gain of function D no wings in the gain of function wings on both the T2 and T3 segments in the loss of function 5 Frogs from line A have a mutation in the A gene When examined more closely aa frogs have white spots on their bellies Frogs from the B line have a mutation in the B gene When examined more closely bb frogs have white stripes on their bellies Wild type frogs do not have any stripes or spots The A and B genes follow a recessive epistasis



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