Y-linked suppressors of the sex-ratio trait in Drosophila mediopunctata.
X-linked meiotic drive causing female-biased progenies is known to occur in nine Drosophila species and is called 'sex-ratio'. In D. mediopunctata this trait is associated with the X:21 chromosome inversion and has variable expression. We describe here a powerful Y-linked suppressor system of sex-ratio expression in this species. There are two types of Y chromosomes (suppressor and nonsuppressor) and two types of X:21 chromosomes (suppressible and unsuppressible). Sex-ratio expression is suppressed in males with the 21suppressible/Ysuppressor genotype, whereas the remaining three genotypes produce female-biased progenies.
de Carvalho
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Departamento de Genética, Universidade Federal do Rio de Janeiro, Brazil.
Klaczko
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D000818:Animals; D004330:Drosophila / Q000235:genetics*; D005260:Female; D016153:Genes, Suppressor; D008040:Genetic Linkage; D008297:Male; D012744:Sex Ratio; D014998:Y Chromosome