Individual skills are inherited from both mother and father. It is likely, therefore, that even simple skills are composed from chunks inherited from the mother and chunks inherited from the father. Challenges include modelling atomic components, indivisible components that come from either one or the other parents, and gluing mechanisms that can compose a viable skill from such components.
Skill sets are also inherited, but the composition rules and mechanisms my be different from those at the single skill level. Among other questions are how gender-specific skills are inherited. Do all individuals carry both sets?