Since we inherit our blood type from our parents, Our Lord's blood type would have to be that of His Mother's entirely, since She was His only human parent. Again, very fascinating.
That's an interesting assertion. Can it be true, however? I'm not sure. For instance, beyond the issue of blood type, all women have XX chromosomes, while all men have XY chromosomes. If all the "human parts" of Our Lord came from Our Lady, where did the Y chromosome come from?
Good question. I find this kind of thing fascinating!
Me too. I think Christ's DNA would have by His Virgin birth been identical with His Mother's in every other respect, except that He was Perfect Man and Our Lady Perfect Woman. The Y chromosome the Holy Ghost would have formed, not out of nothing, but by supernaturally changing what He had received offered from the body of Mary, for if it was created out of nothing, He would not have to her the relation of a Son to His Mother, and would not be "Man of the substance of His mother" as the Athanasian Creed says He is.
If we think back to the creation of Eve in the first place, which is where we know the XX set would have originated, God by special creation created Eve, not out of nothing, as He could have, but rather from the rib of Adam. There too, He must have by His supernatural action effected some great transformation, of the XY into the XX, which here is mirrored and reversed, as is perfectly fitting, since Jesus and Mary are the New Adam and Eve. As St. Paul says, "For as the woman is of the man, so also is the man by the woman: but all things of God." Would Adam and Eve then too have shared such a genetic similarity, do you think, Clare? It seems so to me.
Anyway, for something more solid than any speculation, here is Ven. Mary of Jesus of Agreda describe in City of God the manner of the Incarnation of the Word in the womb of the Blessed Mother at the time of the Annunciation, which says the pure body of Christ was formed from three drops of blood of Mary most holy.
And having conferred with Herself and with the heavenly messenger Gabriel about the grandeur of these high and divine sacraments, and finding Herself in excellent condition to receive the message sent to Her, her purest soul was absorbed and elevated in admiration, reverence and highest intensity of divine love.
By the intensity of these movements and supernal affections, her most pure heart, as it were by natural consequence, was contracted and compressed with such force, that it distilled three drops of her most pure blood, and these, finding their way to the natural place for the act of conception, were formed by the power of the divine and holy Spirit, into the body of Christ our Lord.
Thus the matter, from which the most holy humanity of the Word for our Redemption is composed, was furnished and administered by the most pure heart of Mary and through the sheer force of her true love. At the same moment, with a humility never sufficiently to be extolled, inclining slightly her head and joining her hands, She pronounced these words, which were the beginning of our salvation Fiat mihi secundum verbum tuum (Luke 1,31).
At the pronouncing of this fiat so sweet to the hearing of God and so fortunate for us, in one instant, four things happened. First, the most holy body of Christ our Lord was formed from the three drops of blood furnished by the heart of most holy Mary ...
She was also free from the superfluities caused by sin, which in other women are common and happen naturally in the formation, sustenance and growth of their children. For the necessary matter, which is proper to the infected nature of the descendants of Eve and which was wanting in Her, was supplied and administered in Her by the exercise of heroic acts of virtue and especially by charity.
By the fervor of her soul and her loving affections the blood and humors of her body were changed and thereby divine Providence provided for the sustenance of the divine Child. Thus in a natural manner the humanity of our Redeemer was nourished, while his Divinity was recreated and pleased with her heroic virtues.
Most holy Mary furnished to the Holy Ghost, for the formation of this body, pure and limpid blood, free from sin and all its tendencies. And whatever impure and imperfect matter is supplied by other mothers for the growth of their children was administered by the Queen of heaven most pure and delicate in substance. For it was built up and supplied by the power of her loving affections and her other virtues.