Identification of polygenes in the system achaete-scute in Drosophila melanogaster by means of cluster analysis

Data on location of mobile elements mdg1, Dm412, copia, and B104 in 33 isog enic lines of Drosophila melanogaster has been processed by means of cluste r analysis to reveal the relationship between the penetrance for bristle re duction and the distribution of mobile elements. The presence bf two groups of sites specific for lines with contrasting penetrance levels have been d emonstrated. The specificity suggests that the sites can be associated with the location of corresponding polygenes, affecting the penetrance level in mutant lines.