YCHROMOSOME HYPERPLOIDY AND MALE FERTILITY INDROSOPHILA MELANOGASTER

Abstract
D. melanogaster males with 2 supernumerary Y chromosomes, i.e., triplo-Y males, are completely sterile. The mating behavior is normal, and spermatogenesis and spermiogenesis appear normal, but no sperm are transferred. Most, if not all, of the detrimental effects of a 3rd Y chromosome on male fertility are attributable to the long arm of the Y chromosome.

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