Women Made More Ancestors

A 2004 population-genetics study found that human mitochondrial DNA traces back much deeper than the Y chromosome, pointing to a higher female effective population size over time. In plain terms, that means more women than men contributed genes to later generations across human history. So statistically 2/3 of your ancestors were female, not 1/2. Also, overall throughout humanity, 80% of females end up reproducing, while only 40% of males do.

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