Brett_Genetics PS2

Brett_Genetics PS2 - Bretts Spring Break Genetics Practice...

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Brett’s Spring Break Genetics Practice Problems 1. In sweet peas, the two allelic pairs C, c and P, p are known to effect pigment formation in the flowers. The dominants, C&P, are both necessary for colored flowers. Absence of either results in white flowers. A dihybrid plant is crossed to a white one which is heterozygous at the “C” locus. a. What is the genotype of the dihybrid plant? b. What is the genotype of the white plant? c. What kinds of flowers, colored or white, are to be expected from the cross above? Include the ratio. 2. Assume that another allelic pair in sweet peas also affects pigment formation in addition to the genes mentioned in the question above. The presence of the dominant, R, is required for red flowers. It’s recessive allele, r, produces yellow flowers. What would be the phenotypes of the following plants in relation to flower color? a. CcPpRr b. CcppRR c. CcPPrr d. ccPPRR 3. In a certain breed of dog, the dominant, B, is required for black fur; it’s recessive, b, produces brown fur. However, the dominant, I is the epistatic to the color locus and can inhibit pigment formation. The recessive allele, i, on the other hand, permits pigment deposition in the fur.
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