A gene necessary for late sperm function inDrosophila melanogaster

Abstract
A male‐sterile mutant, ms(1)7, of Drosophila melanogaster is defective in post‐ejaculatory sperm function. The mutant gene is located at one of at least five male fertility loci in 18F through section 20 of the polytene X‐chromosome. It is proposed that the ms(1)7+ gene product modifies a component of the sperm head. A nearby gene may be functionally related to ms(1)7+.