Sapril- Rbond and I are both medical school graduates, and I think he confirmed that you and your colleagues are incorrect on this.
The gene(s) for baldness is(are) not x-linked. This is a common misconception because there is a sex prevalence. A good example of an x-linked gene is red/green color blindness (this is right up my alley, I'm an ophthalmologist), where the faulty gene lives on the x chromosome. People with one copy of the faulty gene (men) actually express the gene. Women with 2 copies of the gene (their father is colorblind and mother's father is colorblind, giving them a chance of getting 2 bad copies) actually express colorblindness. This is very rare, so about 90% of deuteranopes (red/green color blind) are men.
I believe what rbond (the dermatologist) confirms is that the baldness gene(or genes) are not on the x-chromosome but the expression of the trait is influenced by the presence of testosterone (or actually one of its metabolites, 5-DHT).
No offense meant to you or your classmates, but I gotta go with the experienced dermatologist on this one.
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