This Is not 100% true Pete. Most doctors agree that It can come from either side. Hairloss Is a funny thing(not funny ha ha )but not easy to understand,so many variables. Take to brothers for example(Harry&William) one has a thick full head of hair and the other will most likely be a full blown Norwood 5-6 by thirty. Even the so called experts dont claim to understand everything behind hairloss. We know that It's In the genes,but sometimes that gene skips a generation. I guess It's the luck of the draw mate. Mike