Статус доминирования формы половых органов самцов в межвидовых скрещиваниях дрозофил группыvirilis

Abstract

The heritability of the shape of the main species-specific morphological trait for the Drosophila virilis group--the male mating organ has been analyzed using the hybrid males D. virilis x D. lummei and D. virilis x D. novamexicana. The results suggest an increase in the share of the characters with a recessive status in the evolutionarily younger species and demonstrate the role of sex chromosomes in the implementation of a dominant or recessive status of the trait. The roles of additive and epistatic components of the total variation in the evolution of dominance status, shown in several known theoretical models and confirmed by our data, are considered. The published data on sterility of hybrid males in interspecific crosses are discussed from the standpoint of the evolution of dominance.

The effects of the sex chromosomes on the inheritance of species-specific traits of the copulatory organ shape in Drosophila virilis and Drosophila lummei

“…The results are summarized in Table 4. The logic of estimating the degree of dominance for a trait has been described previously [58]. Based on the distribution of the hybrid and parental genotypes over groups isolated by post-hoc comparisons, it is possible to identify the following variants: incomplete dominance, the dominance of the D. virilis, or D. lummei phenotype, and lack of difference among all phenotypes.…”