MONOHYBIRD PROBLEM WITH INCOMPLETE DOMINANCE Petunia flower color is governed by

Question

MONOHYBIRD PROBLEM WITH INCOMPLETE DOMINANCE Petunia flower color is governed by two alleles, but neither allele is truly dominant over the other. Petunias with the genotype R1R1 are red-flowed, those that are heterozygous (R1R2) are pink, and those with the R2R2 genotype are white. This is an example of incomplete dominance. a) If a white-flowered plant is crossed with a red-flowered petunia, what is the genotypic ratio of the F1 offspring? b) What is the phenotypic ratio of the F1 offspring? c) If two of the F1 offspring are crossed, what phenotypes will appear in the F2 generation? d) What will be the genotypic ratio in the F2 generation?

Explanation / Answer

a. R2R2 × R1R1 - Genotypic ratio- 1:1 R1R2(All) b. Phenotypic ratio of F1 offspring - 1:1 All pink

c. R1R2 × R1R2 - Phenotypic ratio- 1R1R1(Red) : 2R1R2(Pink) : 1R2R2( White)

d. F2 genotypic ratio- 1(R1R1) : 2(R1R2) : 1(R2R2)

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