They practice family exogamy and caste endogamy. The Uttar Pradesh Meos maintain a system of community endogamy, and gotra exogamy. Qaums have patrilineal hereditary, with ranked occupations and endogamy. However, these results may principally reflect village endogamy rather than consanguinity per se. They practice endogamy, hypergamy, hereditary occupations, avoid social mixing and have been stratified. Heterophily also may be mentioned in areas such as homogamy, exogamy, and endogamy. In India, caste is a form of social stratification characterized by endogamy. Inequality between ethnic groups and races also correlates with endogamy. The Dhonoje observe strict endogamy; most marriages are arranged by family elders. Racial endogamy is significantly stronger among recent immigrants. Anthropologists refer to these restrictions as endogamy. Only intra-clan marriages are prohibited, as they are considered one type of endogamy. They practice endogamy, or marriage within the clan. Nevertheless, its people are conservatively possessive of its identity preferring a "geographical endogamy" culture. The marital patterns of the Amish are also an example of endogamy.