Page Actions

Half-identical region

From ISOGG Wiki

A half-identical region (HIR) is a region of two paired chromosomes where at least one of the two alleles from one person's pair of chromosomes matches at least one of the two alleles from a different person's pair of chromosomes throughout the entire region. A half-identical region may be either identical by descent (IBD) or identical by state (IBS).[1]

The term half-identical region was coined by the genetic genealogist Leon Kull, who developed HIR Search, a program which was set up to compare autosomal DNA test results from different testing companies.

Further reading


  1. Janzen T. Family finder matches what to make of them. Message posted on the Autosomal DNA Rootsweb mailing list, 19 October 2013.

See also