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Effect of the direction of crosses additional hetero chromatin in the genome of parents and the temperature of their development on the white gene position effect in drosophila melanogaster progeny



Effect of the direction of crosses additional hetero chromatin in the genome of parents and the temperature of their development on the white gene position effect in drosophila melanogaster progeny



Genetika 15(2): 261-272



The influence of various factors on the V-type position effect of the white gene transposed to heterochromatin as a result of different chromosome rearrangements in D. melanogaster was studied. Variegation due to the white gene position effect is much weaker if the flies have received Dp(1;3)wvco from male rather than female parents. The origin of the chromosome rearrangement does not have this effect in the case of T(1;4)wm5 and has it to an insignificant extent in the case of In(1)wm4. The Y-chromosome in the maternal genome strongly suppresses Dp(4;3)wvco-induced variegation even in the progeny which has not received an extra Y-chromosome, but only if this progeny gets Dp(1;3)wvco from the same female. A low temperature (16.degree. C) during maternal development considerably affects the positional effect in the progeny with Dp(1;3)wvco, whereas the temperature of males' development has no influence at all. The maternal temperature effect also occurs when Dp(1;3)wvco is descended from the father, although it is stronger if the mother has been subjected to low temperature treatment before the rearrangement. The influence of temperature seems to take place at final stages of oogenesis. The influence of genotypic and external factors on variegation apparently passes to the next generation of flies in different ways. The direction of crosses and additional Y-chromosome heterochromatin in the maternal genome seem to affect variegation in the progeny through changes in the properties (structure) of the chromosome rearrangement expressing a positional effect.

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Accession: 005276470

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