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- Identical_ancestors_point abstract "In genetic genealogy, the identical ancestors point (IAP) is that last point in a given population's past where each individual then alive turned out to be either the ancestor of every individual alive now or to have no currently living descendants. This point lies further in the past than the population's most recent common ancestor (MRCA).To illustrate the concept, the IAP of one generation unites the population of full siblings; an IAP of two generations unites the population of double first cousins. An IAP of three and four generations would unite the population of quadruple second cousins and octuple third cousins, respectively.The MRCA had many contemporary companions of both sexes. Many of these contemporaries had direct descendants, but not all of them left an unbroken link of descendants all the way down to today's population: in other words, some these contemporaries are ancestors of no one in the current population. The other contemporaries of the MRCA are the ancestors of some but not all of the current population.Because ancestors of the MRCA are by definition also common ancestors, we can continue to find (less recent) common ancestors by pushing further back in time to find more and more ancestors that are the ancestors ancestors of all people alive today. Eventually we will reach a point in the past where all humans can be divided into two groups: those who have no descendants today and those who are common ancestors of all living humans today. This point in time is termed the identical ancestors point. Even though each living person receives genes in dramatically different proportions from these ancestors from the identical ancestors point, all living people share exactly the same set of ancestors from this point back, all the way to the very first single-celled organism.The identical ancestors point for Homo sapiens has been the subject of debate. Simple mathematical models yield implausibly recent dates, a mere few thousand years ago. However, these models do not take into account isolated populations, many of which do indeed still exist today (See uncontacted people). A plausible lower bound on how long ago an identical ancestor existed is the time that Aboriginal Australians diverged from Europeans and Asians, around 65,000 to 75,000 years ago.Note that both the matrilineal and the patrilineal human MRCAs are more remote still, dating to some 200,000 and 338,000 years ago, respectively.Note that the MRCA and his/her ancestors did not pass all their genes down to every person alive today. Because of sexual reproduction, an ancestor only passes "half" of his or her genes on to the next generation. (Technically, it is half of those genes in which the parents differ. All members of a species are genetically very similar; even fruit flies share about half of their genes with humans, and so both parents share the vast majority of their genetic material, and so most of their genes are passed on to their offspring.)The percentage of genes inherited from the MRCA becomes smaller and smaller at every successive generation, as genes inherited from contemporaries of MRCA are interchanged via sexual reproduction.".
- Identical_ancestors_point wikiPageExternalLink news040927-10.html.
- Identical_ancestors_point wikiPageID "2421384".
- Identical_ancestors_point wikiPageLength "5052".
- Identical_ancestors_point wikiPageOutDegree "24".
- Identical_ancestors_point wikiPageRevisionID "673418593".
- Identical_ancestors_point wikiPageWikiLink Aboriginal_Australians.
- Identical_ancestors_point wikiPageWikiLink Category:Family_history.
- Identical_ancestors_point wikiPageWikiLink Category:Genealogy.
- Identical_ancestors_point wikiPageWikiLink Category:Genetic_genealogy.
- Identical_ancestors_point wikiPageWikiLink Category:Human_evolution.
- Identical_ancestors_point wikiPageWikiLink Coefficient_of_relationship.
- Identical_ancestors_point wikiPageWikiLink Cousin.
- Identical_ancestors_point wikiPageWikiLink Double_first_cousin.
- Identical_ancestors_point wikiPageWikiLink Fruit_flies.
- Identical_ancestors_point wikiPageWikiLink Fruit_fly.
- Identical_ancestors_point wikiPageWikiLink Genealogical_DNA_test.
- Identical_ancestors_point wikiPageWikiLink Genealogy.
- Identical_ancestors_point wikiPageWikiLink Genetic_distance.
- Identical_ancestors_point wikiPageWikiLink Genetic_genealogy.
- Identical_ancestors_point wikiPageWikiLink Homo_sapiens.
- Identical_ancestors_point wikiPageWikiLink Last_universal_ancestor.
- Identical_ancestors_point wikiPageWikiLink Mitochondrial_Eve.
- Identical_ancestors_point wikiPageWikiLink Most_recent_common_ancestor.
- Identical_ancestors_point wikiPageWikiLink Mt-Eve.
- Identical_ancestors_point wikiPageWikiLink Pedigree_collapse.
- Identical_ancestors_point wikiPageWikiLink Phylogenetic_tree.
- Identical_ancestors_point wikiPageWikiLink Recent_African_origin.
- Identical_ancestors_point wikiPageWikiLink Recent_African_origin_of_modern_humans.
- Identical_ancestors_point wikiPageWikiLink Sexual_reproduction.
- Identical_ancestors_point wikiPageWikiLink Uncontacted_people.
- Identical_ancestors_point wikiPageWikiLink Uncontacted_peoples.
- Identical_ancestors_point wikiPageWikiLink Y-Adam.
- Identical_ancestors_point wikiPageWikiLink Y-chromosomal_Adam.
- Identical_ancestors_point wikiPageWikiLinkText "Identical ancestors point".
- Identical_ancestors_point wikiPageWikiLinkText "common ancestors".
- Identical_ancestors_point wikiPageWikiLinkText "identical ancestors point".
- Identical_ancestors_point wikiPageWikiLinkText "same set of ancestors".
- Identical_ancestors_point hasPhotoCollection Identical_ancestors_point.
- Identical_ancestors_point wikiPageUsesTemplate Template:Div_col.
- Identical_ancestors_point wikiPageUsesTemplate Template:Div_col_end.
- Identical_ancestors_point wikiPageUsesTemplate Template:Reflist.
- Identical_ancestors_point subject Category:Family_history.
- Identical_ancestors_point subject Category:Genealogy.
- Identical_ancestors_point subject Category:Genetic_genealogy.
- Identical_ancestors_point subject Category:Human_evolution.
- Identical_ancestors_point type Genomic.
- Identical_ancestors_point comment "In genetic genealogy, the identical ancestors point (IAP) is that last point in a given population's past where each individual then alive turned out to be either the ancestor of every individual alive now or to have no currently living descendants.".
- Identical_ancestors_point label "Identical ancestors point".
- Identical_ancestors_point sameAs Bod_identických_předků.
- Identical_ancestors_point sameAs m.02vk9y1.
- Identical_ancestors_point sameAs Q5988206.
- Identical_ancestors_point sameAs Q5988206.
- Identical_ancestors_point wasDerivedFrom Identical_ancestors_point?oldid=673418593.
- Identical_ancestors_point isPrimaryTopicOf Identical_ancestors_point.