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Identity by descent

Not to be confused with lineage-bonded society or isolation by distance, another concept in population genetics with the acronym "IBD".

A DNA segment is identical by descent (IBD) in two or more individuals if:

  • they have inherited it from a common ancestor without recombination, that is, the segment has the same ancestral origin in these individuals
  • the segment is maximal, that is, it is delimited at both ends by ancestral recombination events.[1]
The origin of IBD segments is depicted via a pedigree.
The origin of IBD segments is depicted via a pedigree.
The origin of IBD segments is depicted via a pedigree.
A colorblind-friendly version of this image.
  1. ^ Carmi, Shai (2014). "A renewal theory approach to IBD sharing". Theoretical Population Biology. 97: 35–48. doi:10.1016/j.tpb.2014.08.002. PMC 4179929. PMID 25149691.
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