Final answer:
In philopatries, gender roles and the division of power influence whether males or females stay with their birth group or leave. Patriarchal societies often result in women being marginalized when they join their husband's family, while matrilineal societies trace descent through the female line. The continuation of such systems impacts the distribution of power and resources within societies.
Step-by-step explanation:
In philopatries, there is often a distinct division in which one gender stays within the group while the other leaves. This practice is closely related to concepts of patriarchy and matriarchy. Under a patriarchal system, power tends to be concentrated in the hands of men, influencing social structure and gender roles substantially. Men generally control family resources and make key decisions, both in private and public spheres. Conversely, in matriarchal or matrilineal societies, lineage and inheritance are traced through women, yet true matriarchal societies where women hold power equivalent to men in patriarchal societies are rare. The reason for one gender typically leaving while the other stays can be tied to maintaining alliances, property rights, or lineage, and such practices may disadvantage one gender over the other by placing them in marginal or outsider roles within their new family units.