Family Tree DNA is now (with the rollout of GAP 2.0) reporting multi-copy STR marker results in a single column. As the definitive solution to the problem of displaying multi-copy markers, this new display method and database structure allows us to show the true numbers of certain multi-copy markers, and it is flexible enough to grow indefinitely as the science changes.

Some men have as many as twelve copies of the DYS464 marker. That means they also have from two to six copies of DYS459 and CDY. Using the old system, we would need to change our database structure, corresponding results fields for each Y-Chromosome DNA sample in the database, and every piece of code related to impacted multi-copy markers each time a new number of copies was discovered.

The change allows for both better reporting of results to our customers and better use of user interface development resources.