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exam2 key - AGRY 320 GENETICS EXAM2 25 February 2011 NAME _...

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AGRY 320 GENETICS EXAM2 25 February 2011 NAME _______________________________________________________________________ This exam is worth 100 points. Carefully read all of the information presented and follow the directions. Clearly provide the most likely answer to each question according to the instructions. Showing your work may result in partial credit for incorrect answers.
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2 1. ( 20 points ) A true-breeding strain of Virginia tobacco has dominant alleles determining leaf morphology ( M ), leaf color ( C ), and leaf size ( S ). A Carolina strain is homozygous for the recessive alleles of these three genes These genes are found on the same chromosome as follows: The true breeding Virginia tobacco is crossed to the Carolina strain and an F1 hybrid between the two strains is then backcrossed to the Carolina strain. Assuming that there is no interference, answer the following questions: a) What proportion of the backcross offspring are expected to resemble the Carolina strain’s phenotype for all three traits? ~70% of all offspring will be parental types. The Carolina strain’s (CS) phenotype is ½ of all the parental types. Therefore, we expect ~35% of offspring to resemble CS phenotype. b) What proportion of the backcross progeny will have the leaf morphology and leaf color of the Carolina strain but the leaf size of the Virginia strain? This type is one of the two C and S gene recombinant types.
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exam2 key - AGRY 320 GENETICS EXAM2 25 February 2011 NAME _...

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