How did the Virgin Birth Happen?

A Virgin Birth
The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee… (Luke 2:31, 34-35, KJV)
Now on to the point that is very supernatural – the virgin birth. Virgin birth, known to scientists as parthenogenesis, appears to be rather common in the animal kingdom. So far as anyone can say no mammalian species is capable of giving birth without a father.
First, a mammal’s egg cell usually won’t divide until it receives a signal from the sperm. Second, most mammalian eggs have only half the number of chromosomes necessary for development. If there isn’t any sperm, the embryo will end up with only half the DNA it needs to survive. For a virgin birth to occur there would have to be too many accidents to happen. Only divine intervention could do it.
According to the Bible, the Holy Spirit is the father. The power of the Highest will overshadow Mary. That word means to come over her like a cloud of Shekinah glory and conceive Jesus. You can debate for hours just exactly how it happened and not figure it out. The point is that God miraculously conceived His Son in Mary’s womb. The miracle isn’t His birth, it’s His conception.