In regards to Board Question #22059.
FARMS (The Foundation for Ancient Research and Mormon Studies) which is headquartered at BYU has some excellent articles regarding DNA evidence and the Book of Mormon. One of my favorite articles mentions the fact that there are many contributors to Nephite DNA whose lineage or background we do not know. Primary among these are Ishmael's wife, the wives of his two sons, and the entire Jaredite nation (who interestingly enough most likely traveled from central Asia to northeast Asia and then via barges to the New World). There is a wealth of information at the FARMS website: