Isozyme variability in species of the genus Drosophila. I. A multiple allelic isozyme system in Drosophila busckii: Inheritance and general considerations

Starch gel electrophoretic analysis of a triallelic leucine aminopeptidase polymorphism in a laboratory population of Drosophila busckii is described. The three alleles involved are expressed without dominance. A series of single-pair matings revealed an excess of heterozygous types in most segregating families, suggesting selection against the homozygous genotypes. A few cases of heterogeneity among progeny extracted from a single family were the result of matings that produced Mendelian ratios. These few cases had no clear genetic explanation, but there is a suggestion of two isoalleles for the electrophoretically intermediate enzyme.The research reported here was begun at the University of Hawaii and completed at the University of Texas and was supported (in part) by Public Health Service Research Grant No. GM 11609 to W. S. Stone and M. R. Wheeler and by Training Grant No. 2 T1-GM-337-06 and GM 00337-07 to R. P. Wagner et al., from the National Institutes of Health.