In Drosophila melanogaster lines LA (low activity), HA (high activity), andOregon-R (wild type), the effect of genetic background on endoreplication in giant chromosomes of salivary glands, fecundity, and expression of mutation eywas studied. The degree of chromosome polyteny and the number of adult flies in saturated lines ey LА, ey HА, and ey Or were significantly higher than in the original lines. The degree of chromosome polyteny was correlated with fecundity. The expressivity of the ey character was shown to be far lower in lines ey LА, ey HА, and ey Or than in the original eyelessline. In the saturated lines, the eye facets were reduced to a similar degree. All the lines studied displayed clear-cut sexual distinctions in this parameter. In the ey LА line, the coefficients of variation for the degree of chromosome polyteny, fecundity, and expressivity of the ey mutation were much lower than in lines eyeless, ey LAandey Or .
Russian Journal of Genetics – Springer Journals
Published: Oct 7, 2004
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