Biometrical and chromosome analyses of lines of Drosophila melanogaster selected for central excitation

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Abstract
Lines of Drosophila melanogaster, bidirectionally selected for extreme and opposite expression of central excitatory state (CES), were subjected first to biometrical and then to chromosome analysis. The analyses revealed that (a) low CES expression is partially dominant to high, (b) at least two chromosomes (II and III) are correlated with CES expression, (c) for the low line, both chromosomes, II and III, are necessary for low expression, (d) cytoplasmic factors are involved with CES expression, and (e) loci of minor effect on the X and Y chromosomes are correlated with CES expression.