Comparison in the overlap of transcripts recovered as differentially expressed from the two contrasts with hybrids (Xenopus laevis vs. hybrids and X. muelleri vs. hybrids) and the interspecies contrast (Xenopus laevis vs. X. muelleri).

The congruence between patterns of expression behavior in hybrids compared to the interspecies comparison suggests a model of semidominance where hybrids have an intermediate level of expression compared to the two parental species.