Seems like it....I had it once too and both sides of the pedigree had it. The same bitch in two prior litters (different daddies, large litters) hadn't produced it. One of those daddies has been bred to several other bitches who had produced mega in prior litters w/o an occurrence. So...while certainly NOT science and certainly NOT a large enough sample to say w/ certainty, if I was a betting person, I'd say it needs to be on both sides....but I don't think it's as simple as matching up the recessives (like coats for example). Pretty tough to find a popular pedigree with absolutely no occurrence of mega... Would be LOVELY to have a DNA marker to be sure though...no? Kathy, member GSDCA, DVGSDC Celebrating generations of Dual Titled TC'd Champions visit _http://www.pinehillgsds.com/_ (http://www.pinehillgsds.com/) In a message dated 3/9/2010 8:33:02 P.M. Eastern Standard Time, genoaktortoise@xxxxxxxxxxx writes: Does anyone know if both the sire and dam of a litter of puppies has to carry the mega gene to produce it in a puppy??/TIA Amy Greenhut Justrock German Shepherds Gen Oak Leopard Tortoises & Tortoise Rescue Behold The Turtle, He Makes Progress Only When He Sticks His Neck Out A Quote By James B. Conant ============================================================================ POST is Copyrighted 2009. All material remains the property of the original author and of GSD Communication, Inc. NO REPRODUCTIONS or FORWARDS of any kind are permitted without prior permission of the original author AND of the Showgsd-l Management. ALL RIGHTS RESERVED. ALL PERSONS ARE ON NOTICE THAT THE FORWARDING, REPRODUCTION OR USE IN ANY MANNER OF ANY MATERIAL WHICH APPEARS ON SHOWGSD-L WITHOUT THE EXPRESS PERMISSION OF ALL PARTIES TO THE POST AND THE LIST MANAGEMENT IS EXPRESSLY FORBIDDEN, AND IS A VIOLATION OF LAW. VIOLATORS OF THIS PROHIBITION WILL BE PROSECUTED. For assistance, please contact the List Management at admin@xxxxxxxxxxxx VISIT OUR WEBSITE - http://showgsd.org NATIONAL BLOG - http://gsdnational.blogspot.com/ ============================================================================ ============================================================================ POST is Copyrighted 2009. All material remains the property of the original author and of GSD Communication, Inc. NO REPRODUCTIONS or FORWARDS of any kind are permitted without prior permission of the original author AND of the Showgsd-l Management. ALL RIGHTS RESERVED. ALL PERSONS ARE ON NOTICE THAT THE FORWARDING, REPRODUCTION OR USE IN ANY MANNER OF ANY MATERIAL WHICH APPEARS ON SHOWGSD-L WITHOUT THE EXPRESS PERMISSION OF ALL PARTIES TO THE POST AND THE LIST MANAGEMENT IS EXPRESSLY FORBIDDEN, AND IS A VIOLATION OF LAW. VIOLATORS OF THIS PROHIBITION WILL BE PROSECUTED. For assistance, please contact the List Management at admin@xxxxxxxxxxxx VISIT OUR WEBSITE - http://showgsd.org NATIONAL BLOG - http://gsdnational.blogspot.com/ ============================================================================