The Genetics of Megaselia scalaris Loew (Phoridae): A New Type of Sex Determination in Diptera

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Abstract
The determination of male sex of the Phorid Megaselia scalaris is effected through an epistatically-operating "realizer" which appears to lie terminally on the chromosome and which is exchanged between the 3 non-homologous chromosomes by a regular translocation process. Depending on the site of the "realizer" 1 of the 3 linkage groups displays partial sex-linked heredity. This newly discovered type of alternating sex determination may also be present in the Chironomidae. Crossing-over occurs in the male sex in Megaselia. The crossing-over values in males as compared to females are strongly reduced. The magnitude of this reduction depends on the position of the zone in question in the chromosome.