Abstract
The sex chromosomes of the parental species were tested for effect on trait dominance in the shape of the copulatory system in Drosophila virilis × D. lummei interspecific crosses. The origin of the sex chromosome and the paternal genotype were found to affect the trait dominance in D. lummei × D. virilis and backcross males heterozygous for autosomes. A correlated variability analysis showed that the two sex chromosomes exert unidirectional effects, shifting dominance towards the conspecific phenotype. The effect of the X chromosome is to a great extent determined by epigenetic factors associated with the paternal genotype.
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