A male passes only Y's to his sons. Males pass their X only to their daughters. > -----Original Message----- > From: [email protected] [mailto:autosomal-dna- > [email protected]] On Behalf Of Karen Hodges > Sent: Friday, November 18, 2011 10:55 PM > To: [email protected] > Subject: Re: [AUTOSOMAL-DNA] Base Pair With Full Match > <snip> > > A son passes his X once to his son but that son pass on his mothers > x > <snip>