Final answer:
Descent group endogamy is a marriage practice where individuals marry within a specific subgroup of society, often found in pastoral cultures with unilateral descent.
Step-by-step explanation:
The concept of descent group endogamy refers to a marriage practice where individuals marry within a specific subgroup of society to which they belong, based on their lineage or descent. This practice can be found in various societies, particularly among groups with unilateral descent, where kinship is traced through one gender only (either matrilineal or patrilineal). An example of this would be patrilineal groups within pastoral cultures, where social structures and kinship are organized around the father's lineage. In these societies, marrying within the descent group not only strengthens family ties but also ensures the continuity of property and social status across generations.