It is that I do not have any inkling to tell me that Mary donated half of the chromosomes making up the physical body of Jesus. But you knew that ... catholiciism and you as an apologist for that religion have made assertions which claim Mary did donate half the chromosomes making up the body of Jesus. Prove it
The very word "genealogy" indicates either legal or genetic descent. Jesus was the legal son of Joseph (that puts him legally in the House of David) and the genetic son of Mary (that makes him a human being, the seed of the Original Parents, Adam and Eve.) At least one, probably both genealogies in the NT would be irrelevant if Mary was not Jesus' genetic mother.
Mary's status as genetic mother of Jesus is the precise thing that makes Jesus, "born of a woman, born under the law," "the Word made flesh," the son of David, the son of Abraham, the son of Adam: a member of the human race.
The idea that Mary was not Jesus' genetic mother is a startling innovation the like of which I have never heard of before.
But let me correct myself: I have heard of it ONCE before and that was from the Koran: that Jesus was "created" in Mary's womb, created de novo Adam, and therefre he was *neither* God nor man: not God because He was created, and not Man because he was not any woman's actual son, according to the Koran.
It is not I who have to prove this innovation: it is you.