Fig. 2.

—Detection strategy of parent-of-origin expression: example for Cross 1. Cross 1 was performed using males from the S. mansoni Brazilian strain (BRE) and females from the Guadeloupian strain (GH2). Each hybrid contains a chromosome from the mother (GH2) and from the father (BRE). The trancriptomic analysis of hybrid offspring allowed identifying genes 1) expressed in equal proportions between the mother’s (GH2) and father’s (BRE) allele (i.e., biallelic expression), 2) expressed exclusively from the mother’s (GH2) or father’s (BRE) allele (i.e., monoallelic expression), or 3) expressed preferentially from the mother’s (GH2) or the father’s (BRE) allele (i.e., biased expression).