Answer:
A rare system in which descent is matrilineal for some purposes and patrilineal for others
The matrilineal and patrilineal groups take action in different spheres of society
Step-by-step explanation:
The double descent is considered or described as the type of descent where both patrilineal and matrilineal descent groups are recognized. This means that both descent have right obligations.
In this case, it is known that the double descent is mostly known with the YAko of Nigeria. This people is known to consider the matrilineal descent as important compared to patrilineal which is considered as many as the important one.
Example is inherit land from father's side and religious status from mother's side.