RecLOH

RecLOH is a term in that is an abbreviation for "al Loss of ".

This is a type of which occurs with  by. From a pair of equivalent ("homologous"), but slightly different genes, a pair of identical genes results. In this case there is an unreciprocal exchange of genetic code between the chromosomes, in contrast to, because genetic information is lost.

For Y chromosome
In, the term is used particularly concerning similar seeming events in DNA. This type of mutation happens within one chromosome, and does not involve a reciprocal transfer. Rather, one homologous segment "writes over" the other. The mechanism is presumed to be different from RecLOH events in, since the target is the very same chromosome instead of the homologous one.

During the mutation one of these copies overwrites the other. Thus the differences between the two are lost. Because differences are lost, is lost.

Recombination on the does not only take place during, but virtually at every  when the Y chromosome condenses, because it doesn't require pairing between chromosomes. Recombination frequency even exceeds the frame shift mutation frequency of (average fast) s, however many recombination products may lead to infertile germ cells and "daughter out".

Recombination events (RecLOH) can be observed if YSTR databases are searched for twin alleles at 3 or more duplicated markers on the same palindrome. E.g. (CDY) are located on the same palindrome P1. A high proportion of 9-9, 15-15-17-17, 36-36 combinations and similar twin allelic patterns will be found. PCR typing technologies have been developed (e.g. ) that are able to verify that there are most frequently really two alleles of each, so we can be sure that there is no. Family genealogies have proven many times, that parallel changes on all markers located on the same palindrome are frequently observed and the result of those changes are always twin alleles. So a 9-10, 15-16-17-17, 36-38 haplotype can change in one recombination event to the one mentioned above, because all three markers are affected by one and the same recLOH event.