'"X" chromosomes are inherited from both parents:  those with this designation only from the father'
"Y"
THE HUMAN BODY: X chromosomes are inherited from both parents:  those with this designation only from the father
"X" chromosomes are inherited from both parents:  those with this designation only from the father
"X" chromosomes are inherited from both parents:  those with this designation only from the father
THE HUMAN BODY
"Y"
THE HUMAN BODY