An autosomal recessive eye colour purple inD. obscura is described. The mutant is similar to purple inD. melanogaster but is peculiar in that it acts as a dominant diluter of vermilion. The double recessive vermilion purple is white. The time interaction of the two genes is disussed with reference to the process of pigmentation.
It is suggested that the modes of interaction of these two genes, vermilion and purple, may be explained on the assumption that they are similar in nature and in function, and hence behave as allelomorphs.
Volume 100, 2021
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