A pea plant has a purple allele (i.e., purple is a dominant trait) while and a white allele (i.e., white is a recessive trait), meaning it has a heterozygous genotype.
This means that the plant carries two different alleles for the same gene. In this case, the alleles are for color: purple and white. A heterozygous genotype will not always produce an intermediate phenotype; instead, it can produce either of its two possible phenotypes: purple or white.
This is because one of the two alleles always dominates over the other when they are present on one chromosome together in a heterozygous genotype. Since purple is dominant over white, it will always be expressed in this particular case.
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