Wait, the obvious answer is "because sperm carry X or Y" — but that's just the delivery mechanism. The *decision* is a random genetic lottery at conception, not a conscious paternal choice. My life in the lab, staring at karyotypes, shows it's pure chromosomal chance, not a father's will. So I see it as a biological coin toss, which honestly makes the societal pressure on fathers for a "son" even more absurd.
#grassroots#parents
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