In separate crosses involving homozygous parents the

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Unformatted text preview: brown. In separate crosses involving homozygous parents the following data were obtained: Cross A B C P green X gray green X brown gray X brown F1 all green all green all green F2 3/4 green; 1/4 gray 3/4 green; 1/4 brown 9/16 green; 3/16 brown; 3/16 gray; 1/16 blue a) How many genes are involved? Define gene symbols and indicate which genotypes yield each phenotype. b) In a cross between a gray-eyed cat and one of unknown genotype, the F1 generation was not observed. However, the F2 resulted in the same F2 ratio as in cross C. Determine the genotypes and phenotypes of the unknown P and F1 cats. 6. (2 points) In a plant, a tall variety was crossed with a dwarf variety. All F1 plants were tall. When F1 X F1 plants were interbred, 9/16 of the F2 were tall and 7/16 were dwarf. a) Indicate the number of gene pairs involved and designate which genotypes yield tall and which yield dwarf. (Use dashes where appropriate) b) Of the F2 plants, what proportion of them will be true breeding if self-fertilized? List these genotypes....
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This note was uploaded on 10/24/2012 for the course BIO 231 taught by Professor Cults during the Spring '12 term at University of Texas at Austin.

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