Drosophila eyes are normally red. Several purple-eyed strains have been isolated as spontaneous mutants, and the purple phenotype has been shown to be inherited as a Mendelian autosomal recessive in each case. To investigate allelism between these different purple mutations, two purple-eyed pure strains were crossed. If the purple mutations are in different genes (i.e., they are not allelic), the phenotypic ratios in the F₁ are expected to be:
Select one or more:
a. 100% purple.
b. 50% red: 50% purple.
c. 75% red: 25% purple.
d. 100% red.
e. 25% red: 75% purple