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In separate crosses involving homozygous parents the following data were obtained:
green X gray
green X brown
gray X brown F1
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
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
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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.
- Spring '12