Forms of Marriage
On the Basis of Number of Mates
MONOGAMY POLYGAMY
SERIAL NON-SERIAL POLYGYNY POLYANDRY CENOGAMY
MONOGAMY MONOGAMY
1) SORORAL
POLYGYNY 1) FRATERNAL
POLYANDRY
2) NON-SORORAL
2) NON-
POLYGYNY FRATERNAL
POLYANDRY
On the Basis of rules of mate selection
ENDOGAMY EXOGAMYY