The Future Common Ancestry of All Present-Day Humans

Volume : (13) , Issue : (12), September - 2020

Abstract :

At some future time, each person alive today will be either an ancestor of everyone or an ancestor of no one. If the global population were unstructured by geography, race, religion and other factors, the time to future common ancestry for present-day humans would be between 33 and 66 generations, or about 1000 - 2000 years. In a structured population, migration and intermarriage are the necessary conditions for global common ancestry. Simulation of random and hierarchical migration models, shows that time to future global ancestry is generally less than triple, and often less than twice, that required for an unstructured population. The models suggest that someone alive today will become a common ancestor of the entire world population by about 5000 CE, or sooner; and that all current humans who are destined to become global common ancestors will be so by about 8000 CE, or sooner. At which time, everybody then alive will have the exact same genealogical ancestors from the present day.

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Article No : 12365

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References :

1. Chang, J.T. (1999) Recent Common Ancestors of All Present-Day Individuals. Advances in Applied Probability, 31, 1002-1026. https://doi.org/10.1239/aap/1029955256
2. Rohde, D.L.T., Olson, S. and Chang, J.T. (2004) Modelling the Recent Common Ancestry of All Living Humans. Nature, 431, 562-566. https://doi.org/10.1038/nature02842
3. United States Census Bureau (2018) Selected Social Characteristics in the United States. Table ID: DP02. https://data.census.gov/cedsci/table?q=Table%20ID%3A%20DP02&g=0400000US16&tid=ACSDP1Y2018.DP02&hidePreview=false
4. Statistics Canada (2011) Immigration and Ethnocultural Diversity in Canada. National Household Survey, Catalogue No. 99-010-X2011001. https://www12.statcan.gc.ca/nhs-enm/2011/as-sa/99-010-x/99-010-x2011001-eng.pdf
5. Statistics Sweden (https://www.scb.se/) (2020) Population by Country of Birth, Age and Sex. Year 2000-2020. http://www.statistikdatabasen.scb.se/pxweb/en/ssd/START__BE__BE0101__BE0101E/FodelselandArK/
6. United States Department of Homeland Security (2018) Table 3. Persons Obtaining Lawful Permanent Resident Status by Region and Country of Birth: Fiscal Years 2016 to 2018. https://www.dhs.gov/immigration-statistics/yearbook/2018/table3
7. Statistics Sweden (https://www.scb.se/) (2020) Immigrations and Emigrations by Country of Birth and Sex. Year 2000-2020. http://www.statistikdatabasen.scb.se/pxweb/en/ssd/START__BE__BE0101__BE0101J/ImmiEmiFod/
8. Statistics Canada (2011) Mixed Unions in Canada. National Household Survey, Catalogue No. 99-010-X2011003. https://www12.statcan.gc.ca/nhs-enm/2011/as-sa/99-010-x/99-010-x2011003_3-eng.pdf
9. Livingston, G. and Brown, A. (2017) Intermarriage in the U. S. 50 Years after Loving v. Virginia. Pew Research Center, Washington DC. https://www.pewsocialtrends.org/2017/05/18/intermarriage-in-the-u-s-50-years-after-loving-v-virginia/
10. Office for National Statistics (2014) What Does the 2011 Census Tell Us about Inter-Ethnic Relationships? https://webarchive.nationalarchives.gov.uk/20150505074206/ http://www.ons.gov.uk/ons/dcp171776_369571.pdf
11. United Nations, Department of Economic and Social Affairs, Population Division (2015) International Migrant Stock 2015. https://www.un.org/en/development/desa/population/migration/data/estimates2/estimates15.asp
12. Lachance, J. (2009) Inbreeding, Pedigree Size, and the Most Recent Common Ancestor of Humanity. Journal of Theoretical Biology, 261, 238-247. https://doi.org/10.1016/j.jtbi.2009.08.006
13. Freire-Maia, N. (1982) Inbreeding: Inbreeding Levels in Different Countries. Social Biology, 29, 69-81. https://doi.org/10.1080/19485565.1982.9988479
14. Campbell, R.B. (2009) Time since Common Pedigree Ancestors with Two Progeny per Individual. Mathematical Population Studies, 16, 248-265. https://doi.org/10.1080/08898480903251520

United States Census Bureau (2014) Fertility of Women in the United States. Table 6, Completed Fertility for Women 40 to 50 Years Old by Selected Characteristics: June 2014. https://www.census.gov/data/tables/2014/demo/fertility/women-fertility.html