Preliminary Reading: Matthew 1: 18-25, Luke 1: 26-38
I’m sure that this has been done before, but here’s an theory about the conception of Jesus from biological standpoint.
Some animals have virgin births. Including sharks, Komodo dragons, pit vipers and boa constrictors.
One percent of women claim to have virgin births. This number varies depending on what data you look at, but the point is a good amount of women claim that they have not had intercourse.
If we assume that one percent of women aren’t liars, parthenogenesis is possible in humans.
If parthenogenesis is possible in humans, the offspring is always female. There is no male DNA contributed to the offspring. The resulting baby is called a parthenogen, and because it results from the inheritance of only a single sex chromosome from the mother, it will always be female in animals where two like chromosomes determine the female sex (the XY sex-determination system), and always male in animals where two like chromosomes make for a male (the ZW sex-determination system, where WZ is female, ZZ is male and WW is inviable).
So if Mary actually had a virgin birth, how did she give birth to a boy? The natural [or supernatural, rather] explanation would be that God was the father of the child, meaning half of Jesus’ DNA was literally God’s, making him quite literally the Son of God.