Sex chromosome aneuploidy in a male-linked translocation in Ceratitis capitata

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Abstract
A translocation line in Ceratitis capitata (2n = 12) linking the male-determining Y chromosome with the autosome carrying the alcohol dehydrogenase (Adh) locus was examined to assign the locus to its chromosome. Adh was assigned to chromosome 2, the largest autosome, representing the first correlation between genetic and cytological data in this species. During the study, male adults with 11 and 12 chromosomes were identified in the population and a model was proposed to account for the appearance of these individuals. Predictions made from the model were in general verified by the subsequent experiments. It was shown that 11-chromosome males were more fertile and produced more males than 12-chromosome males. Eleven-chromosome males produced 11- and 12-chromosome progeny, whereas 12-chromosome males produced only 12-chromosome male progeny. The results are discussed with relation to sex determination in this species and to the use of male-linked translocations for the development of genetic sexing techniques.