So assuming that clans tend to get wiped out all of a piece, and males cross clans much less frequently than clans get wiped out, many of the Y-chromosome lines

So assuming that clans tend to get wiped out all of a piece, and males cross clans much less frequently than clans get wiped out, many of the Y-chromosome lines will go extinct, but few of the mitochondrial DNA lines will go extinct? There are a very few matrilocal human societies; perhaps they show the obverse pattern.