At least 50/50. Could be greater than (but is no less) than 50 percent wagyu genetics. The domestic wagyu ground beef is all from a single type of animal — one that is a cross breed of Wagyu and Angus with more than 50% by DNA being Wagyu.
Please click this link to learn more about domestic wagyu: https://www.crowdcow.com/blog/introducing-wagyu-angus-cross-like-prime-steaks-elevated