[Elsie]

Jesus is. direct descendant of David maybe implying there is some genetic component.

And RAHAB is in the lineage; too.

So what does THAT indicate??

[MHGinTN]

Non sequitur ... Rahab lived long before David, and Messiah is identified as ascending David's throne, a son of David, Son of Man.

Since God can go anywhere in time and space, there are two sources for the zygotic Jesus that come to mind: Adam and Eve, and David and Bathsheba. This side of the veil, we will not have a definitive answer.