I have spherocytosis, hereditary. It is transmitted from parents to children. What if you have the same prevalence in men as in women, depends on which parent of yours has the gene. Mothers who have spend all their male children, with a 50 percent chance of obtaining that gene, in contrast to women will not pass the gene, and men will pass it on to their daughters, with a hundred percent chance that they will get that gene, in contrast to their male children do not.