And he didn't have a father?
immaculate conception?
No immaculate conception at all. It just means that the descendants of any other male humans perished without contributing their Y-chromosome to any of the males in today’s world. All present males have inherited the Y-chromosome of this single human male who lived in the distant past. The date is surmised by relationships to surviving DNA and time periods required to accumulate changes in the genes due to natural causes over time.