He isn't a Jew, Jewish sperm is meaningless. Only Jewish eggs are important.
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Why is interesting but irrelevant. The fact is that Jewishness is passed down matrilineally regardless of other things that are passed down patrilineally. We do not accept paternal half-Jews as Jews (although Reform communities do if they were raised Jewish).
Religiously, Orthodox Jewish services do not call up or make references to individual women. In the one exception that they do, the mi shebeyrakh, women are referred to by their mother's name (Sara bat Rivka), by the way.
Interesting, especially in light of the fact that Ashkenazi Jews get most of their Israelite ancestry from their paternal lines.
But it kinda makes sense to me, because while you will always know who your mother is, the identity of your biological father was unverifiable until the advent of DNA testing.
No its important because haplogroups will tell you who you are related to directly and accurately you can be 14 percent italian it doesnt mean shit and you can only guess how you are related to soneone else if you are cousins. You need geneology paper haplogroups are pretty nuch set your this off spring. Autosomal dna ,recombines and mutates too fast haplogroups is more valuable for deep geneology than autosomal dna.