Endogamy is the practice of marrying within a specific

social group In the social sciences, a social group can be defined as two or more people who interact with one another, share similar characteristics, and collectively have a sense of unity. Regardless, social groups come in a myriad of sizes and varieties ...

religious denomination A religious denomination is a subgroup within a religion that operates under a common name and tradition among other activities. The term refers to the various Christian denominations (for example, Eastern Orthodox, Catholic, and the many varie ...

caste Caste is a form of social stratification characterised by endogamy, hereditary transmission of a style of life which often includes an occupation, ritual status in a hierarchy, and customary social interaction and exclusion based on cultura ...

, or

ethnic group An ethnic group or an ethnicity is a grouping of people who identify with each other on the basis of shared attributes that distinguish them from other groups. Those attributes can include common sets of traditions, ancestry, language, history, ...

, rejecting those from others as unsuitable for marriage or other close personal relationships. Endogamy is common in many cultures and ethnic groups. Several

religious Religion is usually defined as a social system, social-cultural system of designated religious behaviour, behaviors and practices, morality, morals, beliefs, worldviews, religious text, texts, sacred site, sanctified places, prophecy, prophecie ...

and ethnic religious groups are traditionally more endogamous, although sometimes with the added dimension of requiring marital religious conversion. This permits an

exogamous Exogamy is the social norm of marrying outside one's social group. The group defines the scope and extent of exogamy, and the rules and enforcement mechanisms that ensure its continuity. One form of exogamy is dual exogamy, in which two groups ...

marriage, as the convert, by accepting the partner's religion, becomes accepted within the endogamous rules. Endogamy, as distinct from

consanguinity Consanguinity ("blood relation", from Latin '' consanguinitas'') is the characteristic of having a kinship with another person (being descended from a common ancestor). Many jurisdictions have laws prohibiting people who are related by blood fr ...

, may result in transmission of

genetic disorder A genetic disorder is a health problem caused by one or more abnormalities in the genome. It can be caused by a mutation in a single gene (monogenic) or multiple genes (polygenic) or by a chromosomal abnormality. Although polygenic disorders ...

s, the so-called founder effect, within the relatively closed community.

Adherence

Endogamy can serve as a form of self-segregation; a community can use it to resist integrating and completely merging with surrounding populations. Minorities can use it to stay ethnically homogeneous over a long time as distinct communities within societies that have other practices and beliefs. The

isolationist Isolationism is a political philosophy advocating a national foreign policy that opposes involvement in the political affairs, and especially the wars, of other countries. Thus, isolationism fundamentally advocates neutrality and opposes entan ...

practices of endogamy may lead to a group's extinction, as genetic diseases may develop that can affect an increasing percentage of the population. However, this disease effect would tend to be small unless there is a high degree of close inbreeding, or if the endogamous population becomes very small in size.

Social dynamics

The Urapmin, a small tribe in

Papua New Guinea Papua New Guinea (abbreviated PNG; , ; tpi, Papua Niugini; ho, Papua Niu Gini), officially the Independent State of Papua New Guinea ( tpi, Independen Stet bilong Papua Niugini; ho, Independen Stet bilong Papua Niu Gini), is a country i ...

, practice strict endogamy. The Urapmin also have a system of kinship classes known as ''tanum miit''. Since the classes are inherited cognatically, most Urapmin belong to all of the major classes, creating great fluidity and doing little to differentiate individuals. The small community on the

South Atlantic The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe an ...

island of

Tristan da Cunha Tristan da Cunha (), colloquially Tristan, is a remote group of volcanic islands in the South Atlantic Ocean. It is the most remote inhabited archipelago in the world, lying approximately from Cape Town in South Africa, from Saint Helena ...

are, because of their geographical isolation, an almost endogamic society. There are instances of health problems attributed to endogamy on the island, including

glaucoma Glaucoma is a group of eye diseases that result in damage to the optic nerve (or retina) and cause vision loss. The most common type is open-angle (wide angle, chronic simple) glaucoma, in which the drainage angle for fluid within the eye rem ...

and

asthma Asthma is a long-term inflammatory disease of the airways of the lungs. It is characterized by variable and recurring symptoms, reversible airflow obstruction, and easily triggered bronchospasms. Symptoms include episodes of wheezing, cou ...

as research by the

University of Toronto The University of Toronto (UToronto or U of T) is a public research university in Toronto, Ontario, Canada, located on the grounds that surround Queen's Park. It was founded by royal charter in 1827 as King's College, the first institution ...

has demonstrated.

Genealogy

Endogamic marriage patterns may increase the frequency of various levels of

cousin marriage A cousin marriage is a marriage where the spouses are cousins (i.e. people with common grandparents or people who share other fairly recent ancestors). The practice was common in earlier times, and continues to be common in some societies toda ...

in a population, and may cause high probability of children of first, second, third cousins, etcetera. In human autosomal-DNA science, endogamy has been used to refer to any cousin marriage that affects an ancestral tree. If a cousin marriage has accrued in a known ancestral tree of a person, in historical time, it is referred to as

pedigree collapse In genealogy, pedigree collapse describes how reproduction between two individuals who share an ancestor causes the number of distinct ancestors in the family tree of their offspring to be smaller than it could otherwise be. Robert C. Gunderson c ...

. This may cause relations along multiple paths between a persons autosomal-DNA matches. It creates stronger DNA matches between the DNA matches than expected from the nearest path. Cousin marriage should not be confused with

double cousin Most generally, in the lineal kinship system used in the English-speaking world, a cousin is a type of familial relationship in which two relatives are two or more familial generations away from their most recent common ancestor. Commonly, ...

s, which do not cause a pedigree collapse. Certain levels of

sibling marriage This article gives a list of individuals who have been romantically or maritally coupled with a sibling. This list does not include coupled siblings in fiction, although ones from mythology and religion are included. Terminology There are many ...

and cousin marriage is prevented by law in some countries, and referred to as

. A long term pattern of endogamy in a region may increase the risk of repeated cousin marriage during a long period of time, referred to as

inbreeding Inbreeding is the production of offspring from the mating or breeding of individuals or organisms that are closely related genetically. By analogy, the term is used in human reproduction, but more commonly refers to the genetic disorders and o ...

. It may cause additional noise in the DNA autosomal data, giving the impressions that DNA matches with roots in that region are more closely related than they are.

Examples

Examples of ethnic and religious groups that have typically practiced endogamy include: *

Alawites The Alawis, Alawites ( ar, علوية ''Alawīyah''), or pejoratively Nusayris ( ar, نصيرية ''Nuṣayrīyah'') are an ethnoreligious group that lives primarily in Levant and follows Alawism, a sect of Islam that originated from Shia Isl ...

* The

Amish The Amish (; pdc, Amisch; german: link=no, Amische), formally the Old Order Amish, are a group of traditionalist Anabaptist Christian church fellowships with Swiss German and Alsatian origins. They are closely related to Mennonite churc ...

of North America. *Various

Arab tribes The Tribes of Arabia () or Arab tribes () are the ethnic Arab tribes and clans that originated in the Arabian Peninsula. The tribes of Arabia descend from either one of the two Arab ancestors, Adnan or Qahtan. Arab tribes have historically inhabit ...

* Assyrians, indigenous Christian people of upper

Mesopotamia Mesopotamia ''Mesopotamíā''; ar, بِلَاد ٱلرَّافِدَيْن or ; syc, ܐܪܡ ܢܗܪ̈ܝܢ, or , ) is a historical region of Western Asia situated within the Tigris–Euphrates river system, in the northern part of the F ...

. *

Armenians Armenians ( hy, հայեր, ''hayer'' ) are an ethnic group native to the Armenian highlands of Western Asia. Armenians constitute the main population of Armenia and the ''de facto'' independent Artsakh. There is a wide-ranging diaspora ...

have a history of endogamy due to being almost entirely surrounded by Islamic neighbours while being a strongly Christian nation. *

Coptic Christians Copts ( cop, ⲛⲓⲣⲉⲙⲛ̀ⲭⲏⲙⲓ ; ar, الْقِبْط ) are a Christian ethnoreligious group indigenous to North Africa who have primarily inhabited the area of modern Egypt and Sudan since antiquity. Most ethnic Copts are Co ...

Daylamites The Daylamites or Dailamites (Middle Persian: ''Daylamīgān''; fa, دیلمیان ''Deylamiyān'') were an Iranian people inhabiting the Daylam—the mountainous regions of northern Iran on the southwest coast of the Caspian Sea, now comprisin ...

, an ethnic group living south of the

Caspian Sea The Caspian Sea is the world's largest inland body of water, often described as the world's largest lake or a full-fledged sea. An endorheic basin, it lies between Europe and Asia; east of the Caucasus, west of the broad steppe of Central Asia ...

in ancient and medieval Persia. *

Druze The Druze (; ar, دَرْزِيٌّ, ' or ', , ') are an Arabic-speaking esoteric ethnoreligious group from Western Asia who adhere to the Druze faith, an Abrahamic, monotheistic, syncretic, and ethnic religion based on the teachings of ...

Gitanos The Romani in Spain, generally known by the exonym () or the endonym ''Calé'', belong to the Iberian Cale Romani subgroup, with smaller populations in Portugal (known as ) and in Southern France. Their sense of identity and cohesion stems f ...

typically practice endogamy within their ''raza'', or patrigroup. *

Greek Cypriots Greek Cypriots or Cypriot Greeks ( el, Ελληνοκύπριοι, Ellinokýprioi, tr, Kıbrıs Rumları) are the ethnic Greek population of Cyprus, forming the island's largest ethnolinguistic community. According to the 2011 census, 659,115 r ...

usually practice endogamy in order to maintain their status as the majority ethnic group on the island of

Cyprus Cyprus ; tr, Kıbrıs (), officially the Republic of Cyprus,, , lit: Republic of Cyprus is an island country located south of the Anatolian Peninsula in the eastern Mediterranean Sea. Its continental position is disputed; while it is geo ...

. *

Iranian Turkmen Iranian Turkmens ( fa, ترکمن‌های ایران; tk, ایران تۆرکمن‌لری, Eýran Türkmenleri) are a branch of Turkmen people living mainly in northern and northeastern regions of Iran. Their region is called Turkmen Sahra an ...

s *

Judaism Judaism ( he, ''Yahăḏūṯ'') is an Abrahamic, monotheistic, and ethnic religion comprising the collective religious, cultural, and legal tradition and civilization of the Jewish people. It has its roots as an organized religion in the ...

traditionally mandates religious endogamy, requiring that both marriage partners be Jewish, while allowing for marriage to converts.

Orthodox Judaism Orthodox Judaism is the collective term for the traditionalist and theologically conservative branches of contemporary Judaism. Theologically, it is chiefly defined by regarding the Torah, both Written and Oral, as revealed by God to Moses on M ...

maintains the traditional requirement for endogamy in Judaism as a binding,'' Kiddushin'' 68b inherent part of Judaism's religious beliefs and traditions. * The

Knanaya The Knānāya, (from Syriac: ''Knā'nāya'' (Canaanite)) also known as the Southists or Tekkumbhagar, are an endogamous ethnic group found among the Saint Thomas Christian community of Kerala, India. They are differentiated from another part of ...

, an endogamous group within the St. Thomas Christian Community of India. The community claims to have arrived to India in the fourth century and have been noted for their historical practice of endogamy. * Members of

the Church of Jesus Christ of Latter-day Saints The Church of Jesus Christ of Latter-day Saints, informally known as the LDS Church or Mormon Church, is a Nontrinitarianism, nontrinitarian Christianity, Christian church that considers itself to be the Restorationism, restoration of the ...

or other religious and/or cultural groups relating to

Mormonism Mormonism is the religious tradition and theology of the Latter Day Saint movement of Restorationist Christianity started by Joseph Smith in Western New York in the 1820s and 1830s. As a label, Mormonism has been applied to various aspects of t ...

* Syrian Christians of Kerala, India - but

Marital conversion Marital conversion is religious conversion upon marriage, either as a conciliatory act, or a mandated requirement according to a particular religious belief. Endogamous religious cultures may have certain opposition to interfaith marriage and e ...

is allowed. *

Parsis Parsis () or Parsees are an ethnoreligious group of the Indian subcontinent adhering to Zoroastrianism. They are descended from Persians who migrated to Medieval India during and after the Arab conquest of Iran (part of the early Muslim co ...

. *

Rajput Rajput (from Sanskrit ''raja-putra'' 'son of a king') is a large multi-component cluster of castes, kin bodies, and local groups, sharing social status and ideology of genealogical descent originating from the Indian subcontinent. The term Ra ...

s * The

Vaqueiros de alzada The Vaqueiros de Alzada ( Asturian: Vaqueiros d'Alzada, "nomadic cowherds" in Asturian language, from their word for cow, cognate of Spanish ) are a northern Spanish nomadic people in the mountains of Asturias and León, who traditionally practi ...

of Spain. *

Yazidis Yazidis or Yezidis (; ku, ئێزیدی, translit=Êzidî) are a Kurmanji-speaking Endogamy, endogamous minority group who are indigenous to Kurdistan, a geographical region in Western Asia that includes parts of Iraq, Syria, Turkey and Iran ...

Mandaeans Mandaeans ( ar, المندائيون ), also known as Mandaean Sabians ( ) or simply as Sabians ( ), are an ethnoreligious group who are followers of Mandaeism. They believe that John the Baptist was the final and most important prophet. They ...

* Many

Hindu Hindus (; ) are people who religiously adhere to Hinduism.Jeffery D. Long (2007), A Vision for Hinduism, IB Tauris, , pages 35–37 Historically, the term has also been used as a geographical, cultural, and later religious identifier for ...

jatis on the

Indian subcontinent The Indian subcontinent is a list of the physiographic regions of the world, physiographical region in United Nations geoscheme for Asia#Southern Asia, Southern Asia. It is situated on the Indian Plate, projecting southwards into the Indian O ...

, as well as many endogamous baradaris among some South Asian Muslims

References

External links