They are generally considered “carriers” of the recessive allele: the recessive allele is there, but the recessive phenotype is not.

A recessive allele will produce a recessive phenotype, the individual must have two copies, one from each parent.

Those that inherit more recessive alleles will have a greater expression of the recessive phenotype.

To inherit a recessive phenotype, he must inherit recessive alleles from both parents.

The theory is that this particular strain has a recessive phenotype that allows it to better convert glucose into anthocyanins.