Some places to look for additional information: http://www.familytreedna.com/GLOSSARY.HTML http://www.familytreedna.com/dna101.html follow some of their links Consider buying a book - http://www.familytreedna.com/books.html - I think Trace Your Roots with DNA : Using Genetic Tests to Explore Your Family Tree by Megan Smolenyak, Ann Turner is a good place to start. I like pictures also. This is an example of DYS393 and shows 15 repeats (alleles) http://www.smgf.org/ychromosome/marker_details.jspx?marker=DYS393 Jim Barrett - Timpson, TX [email protected] wrote: > I know absolutely nothing about alleles etc.Can you test beyond 67 markers? sylvia(james Jones)of the Gold group.I match Willie.