The graphs below show the phenotypic distribution of anthocyanin concentration in the petals of two different strains of wild wildflower, Strain A and Strain B.
Which of the following statements correctly identifies the type of variation shown by each strain and explains its genetic and environmental basis?
Strain A displays continuous variation controlled by a single gene with codominant alleles, whereas Strain B displays discontinuous variation because it is controlled by polygenes that are highly influenced by soil pH.
Strain A displays discontinuous variation controlled by a single gene with codominant alleles, whereas Strain B displays continuous variation controlled by multiple additive genes (polygenic inheritance) and influenced by environmental factors.
Both Strain A and Strain B display continuous variation because both feature phenotypes spread across a quantitative scale of 000 to 120120120 arbitrary units of anthocyanin.
Both Strain A and Strain B display discontinuous variation because Strain A has three discrete genetic categories and Strain B's variation is ultimately determined by distinct, discrete genotypes.