DIRECTIONALITY HYPOTHESIS. “This is because females harboring additional Wolbachia strains will be compatible with all males in the population. An equivalent process will promote the invasion and maintenance of cif paralogs within the same genome, provided that they encode bidirectionally incompatible modification and rescue factors. If bidirectionally incompatibility evolves gradually, this hypothesis predicts that paralogous cif genes within a genome might be distantly related.”
https://lnkd.in/dXjWp9f