The intermediate color or rather condition, in this case "roan", is a result of two alleles being codominant. Codominance occurs when the phenotype (or the physical expression of the gene) of a heterozygote individual expresses both the alleles in a pair of genes. In the given situation, both parents are homozygotes.
Brain. :) that's your answer haha
Answer:
Each trait of a plant is determined by a pair of genes.
It's long cuz that's how there made.