I would like a clarification.
Fr Serpa gave the following response.
Even though Jesus received all this genetic inheritance from His mother, He did not receive His blood from her. The baby in the womb is completely separate from the mother. Often the child will have an entirely different blood type from the mother. His blood was solely His.
Fr. Vincent Serpa, O.P
Mary is the sole human componant in the incarnation. Since Jesus received all [100 %] of His genetic inheritance from Mary, why not her blood type also? And if He didn’t get His blood from her, how do we know He didn’t? Who did he get it from?