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Statistically, about 105 boys are born for every 100 girls. Biologists note this is nature's way of compensating because male fetuses and infants are significantly more vulnerable to disease, genetic defects, and infant mortality. The X-Chromosome Safety Net: Because females have two X chromosomes, if one has a genetic defect, the backup X can override it, cue Mary Lyon and Lyonization. Males XY have no backup. If their single X chromosome has a mutation, they suffer the full force of the disease, like hemophilia or color blindness.Ancient patriarchs built an entire civilization on the premise that they were the strong, default template of humanity, when science proves they are the fragile variation. Experiencing that realization completely changes how you view history.