Question

B. In sweet peas, the synthesis of purple anthocyanin pigment in the petals is controlled by two genes, B and D. The pathway is... Gene B | Enzyme B | white intermediate -> blue intermediate Gene D | Enzyme D | blue intermediate -> anthocyanin (purple) a. What petal color would you expect in a pure breeding plant unable to catalyze the first reaction? Indicate the genotype and phenotype. b. What petal color would you expect in a pure breeding plant unable to catalyze the second reaction? Indicate the genotype and phenotype. c. If plants 1 and 2 are crossed, what petal color would the F1 plants have? Indicate the genotype and phenotype. d. What ratio of purple : blue : white plants would you expect in the F2? Indicate the genotypes, phenotypes, and the F2 phenotypic ratio.

          B. In sweet peas, the synthesis of purple anthocyanin pigment in the petals is controlled by two genes, B and D. The pathway is...

Gene B
|
Enzyme B
|
white intermediate -> blue intermediate

Gene D
|
Enzyme D
|
blue intermediate -> anthocyanin (purple)

a. What petal color would you expect in a pure breeding plant unable to catalyze the first reaction? Indicate the genotype and phenotype.
b. What petal color would you expect in a pure breeding plant unable to catalyze the second reaction? Indicate the genotype and phenotype.
c. If plants 1 and 2 are crossed, what petal color would the F1 plants have? Indicate the genotype and phenotype.
d. What ratio of purple : blue : white plants would you expect in the F2? Indicate the genotypes, phenotypes, and the F2 phenotypic ratio.

B. In sweet peas, the synthesis of purple anthocyanin pigment in the petals is controlled by two genes, B and D. The pathway is...

Gene B
|
Enzyme B
|
white intermediate -> blue intermediate

Gene D
|
Enzyme D
|
blue intermediate -> anthocyanin (purple)

a. What petal color would you expect in a pure breeding plant unable to catalyze the first reaction? Indicate the genotype and phenotype.
b. What petal color would you expect in a pure breeding plant unable to catalyze the second reaction? Indicate the genotype and phenotype.
c. If plants 1 and 2 are crossed, what petal color would the F1 plants have? Indicate the genotype and phenotype.
d. What ratio of purple : blue : white plants would you expect in the F2? Indicate the genotypes, phenotypes, and the F2 phenotypic ratio.

Added by April S.

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