| Re: hereditary hair loss
I believe it is passed on through the mother. It is something like colorblindness. Mom may not be colorblind but she can pass it on to her children because she carries a dormant form of the gene.
Mom may not have thinning hair (unlikly that she would I suppose), but if her father gave her a dormant form of the gene, she may pass it on, then the gene will become expresses in her male offspring.
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