All genes interact with other genes, and their additive effects and epistatic interactions affect
an organism's phenotype and fitness. Recent theoretical and empirical work has advanced …

The classical definition posits hybrid sterility as a phenomenon when two parental taxa each
of which is fertile produce a hybrid that is sterile. The first hybrid sterility gene in vertebrates …

Molecular analyses of closely related taxa have increasingly revealed the importance of
higher-order genetic interactions in explaining the observed pattern of reproductive isolation …