If that is the case - that Mary was a "holy incubator" then our Lord would have had some type of flesh that was other than human.This view (Nestorianism) of the Incarnation was condemned by the Third Ecumenical Council.
Opinion on both sides of fallible men. God is capable of creating pure, sinless, everlasting male flesh, as he did for Adam before he fell. That I know. I also know that Miriam could not produce the seed (1st complete cell with y-chromosome) from her flesh. Let the 3rd Ecumenical Council struggle with that. But The God could produce Eve from Adam's flesh, removing the y-chromosome in every single cell in her body. She was an Eve, not a Steve.
Carry your thought a little further than the catechismal box which attempts to put humanistic boundaries on The Omniscient, Omnipotent God from simplistic reasoning without spiritual discernment, even contradicting His Holy Scriptures -- trying to push back original sin one generation by the quasilogical but human-reasoned "immaculate conception." That is just making Miriam's mother a "holy incubator" also.
Come on. You'll just have to face the idea that the early divines lacked the further insight lent by discovery of the method by which The God designed replication of Adam's flesh -- the science of meiosis, mitosis, and genetics. Their conclusions are not Spirit-given -- just unworkable hypothecation.
Better yet, how would you come up with the source of His uncorruptible Holy Blood (red blood cells have no DNA, if that is what is in His Blood). I firmly believe all of that Blood is now placed on the True Heavenly Mercyseat, never to die or corrupt, a precious life-giving sin-washing substance continually providing reconciliation. Was that Blood of Miriam? I think not, in my human reasoning, but I believe in His Person and His Blood as living forever.