values affect the distribution of income, wealth, and property in a given social order. Race Racism consists of both prejudice and discrimination based in social perceptions of observable biological differences between peoples. It often takes the form of social actions, practices or beliefs, or political systems in which different races are perceived to be ranked as inherently superior or inferior to each other, based on presumed shared inheritable traits, abilities, or qualities. In a given society, those who share racial characteristics socially perceived as undesirable are typically under-represented in positions of social power, i.e., they become a minority category in that society. Minority members in such a society are often subjected to discriminatory actions resulting from majority policies, including assimilation, exclusion, oppression, expulsion, and extermination. Overt racism usually feeds directly into a stratification system through its effect on social status. For example, members associated with a particular race may be assigned a slave status, a form of oppression in which the majority refuses to grant basic rights to a minority that are granted to other members of the society. More covert racism, such as that which many scholars posit is practiced in more contemporary societies, is socially hidden and less easily detectable. Covert racism often feeds into stratification systems as an intervening variable affecting income, educational opportunities, and housing. Both overt and covert racism can take the form of structural inequality in a society in which racism has become institutionalized. Ethnicity Ethnic prejudice and discrimination operate much the same as do racial prejudice and discrimination in society. In fact, only recently have scholars begun to differentiate race and ethnicity; historically, the two were considered to be identical or closely related. With the scientific development of genetics and the human genome as fields of study, most scholars now recognize that race is socially defined on the basis of biologically determined characteristics that can be observed within a society while ethnicity is defined on the basis of culturally learned behavior. Ethnic identification can include shared cultural heritage such as language and dialect, symbolic systems, religion, mythology and cuisine. As with race, ethnic categories of persons may be socially defined as minority categories whose members are under-represented in positions of social power. As such, ethnic categories of persons can be subject to the same types of majority policies. Whether ethnicity feeds into a stratification system as a direct, causal factor or as an