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An ancestor or forebear is a parent or (recursively) the parent of an antecedent (i.e., a grandparent, great-grandparent, great-great-grandparent, and so forth). Ancestor is "any person from whom one is descended. In law the person from whom an estate has been inherited."[1] Two individuals have a genetic relationship if one is the ancestor of the other, or if they share a common ancestor. In evolutionary theory, species which share an evolutionary ancestor are said to be of common descent. However, this concept of ancestry does not apply to some bacteria and other organisms capable of horizontal gene transfer. Some research suggests that the average person has twice as many female ancestors as male ancestors. This might have been due to the past prevalence of polygynous relations and female hypergamy.[2] Assuming that all of an individual's ancestors are otherwise unrelated to each other, that individual has 2n ancestors in the nth generation before him and a total of 2g+1 − 2 ancestors in the g generations before him. In practice, however, it is clear that the vast majority of ancestors of humans (and any other species) are multiply related (see pedigree collapse). Consider n = 40: the human species is more than 40 generations old, yet the number 240, approximately 1012 or one trillion, dwarfs the number of humans who have ever lived. Some cultures confer reverence to ancestors, both living and dead; in contrast, some more youth-oriented cultural contexts display less veneration of elders. In other cultural contexts, some people seek providence from their deceased ancestors; this practice is sometimes known as ancestor worship or, more accurately, ancestor veneration. See also[edit]

Collateral descendant Consanguinity DNA

Autosomal DNA Mitochondrial DNA

Ethnic group Family Genealogy Genetic genealogy Kinship Lineage (anthropology) Lineal descendant Most recent common ancestor Archaic humans Progenitor

Notes[edit]

^ Websters New World Dictionary. Cleveland and New York: The World Publishing Company.  ^ https://tierneylab.blogs.nytimes.com/2007/09/05/the-missing-men-in-your-family-tree/

External links[edit]

Media related to Ancestors at Wikimedia Commons The dictionary definition of ancestor at Wiktionary Quotations related to Ancestors at Wikiquote United States Census Bureau

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Family

History Household Nuclear family Extended family Conjugal family Immediate family Matrifocal family Blended family Dysfunctional family Polyfidelitous families

First-degree relatives

Parent

father mother

Child

son daughter

Sibling

brother sister

Second-degree relatives

Grandparent Grandchild Aunt Uncle Nephew and niece

Third-degree relatives

Great-grandparent Great-grandchild Grandnephew and grandniece Cousin

Family-in-law

Spouse

wife husband

Parents-in-law Siblings-in-law Son-in-law Daughter-in-law

Stepfamily

Stepfather Stepmother Stepchild Stepsibling

Kinship

Australian Aboriginal kinship Adoption Affinity Consanguinity Disownment Divorce Estrangement Fictive kinship Marriage Nurture kinship

Lineage

Bilateral descent Common ancestor Family
Family
name Family
Family
tree Genealogy Heirloom Heredity Inheritance Lineal descendant Matrilineality Patrilineality Pedigree chart Progenitor

Relationships

Agape
Agape
(parental love) Eros (marital love) Filial piety Storge
Storge
(familial love)

Holidays

Mother's Day

U.S.

Father's Day Father– Daughter
Daughter
Day Siblings Day National Grandparents Day Parents' Day Children's Day Family
Family
Day

Canada

American Family
Family
Day National Family
Family
Week

UK

Related

Wedding anniversary Sociology of the family Mu

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