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Identity by descent
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<p>A <a href="/facts/DNA/nB89Iauz">DNA</a> segment is identical by descent (IBD) in two or more individuals if: </p> <ul><li>they have inherited it from a common ancestor without <a href="/facts/Genetic_recombination/uocNH0m7">recombination</a>, that is, the segment has the same ancestral origin in these individuals</li> <li>the segment is maximal, that is, it is delimited at both ends by ancestral recombination events.</li></ul>