New answers tagged epigenetics
The hairs you mention are also called "androgenic hairs", meaning their growth and pigmentation is influenced by androgens. These include pubic hair, the hairs on the breast and shoulders (almost exclusively for men) and the beard. It seems, that these hair bulbs have different sensibilities (number and expression of androgen receptors) so they react ...
I've heard it mentioned that gene dosage is implicated in this. Gene dosage is the number of the alleles present in the cell.
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