Red eyes is the wild-type phenotype in Drosophila, and several different genes (with each gene existing in two or more alleles) affect eye color. One allele causes purple eyes, and a different allele causes vermilion eyes. Both of these alleles are recessive to the red eye color allele. Two types of crosses provided the following results:

Cross 1: Males with vermilion eyes × females with purple eyes 354 offspring, all with red eyes Cross 2: Males with purple eyes × females with vermilion eyes 212 male offspring with vermilion eyes 221 female offspring with red eyes Explain the pattern of inheritance based on these results. What additional crosses might you make to confirm your hypothesis?