All races of males have male pattern balding; however, the American Indians whose ancestors came out of the Alaskan Bridge, have no balding present. This is most unusual because their ancestors have balding. There has been a suggestion that the absence of balding in this group of American Indians may have reflected some cultural ethnic cleansing in the very early days when the immigration happened and the populations were very small. With this thesis, the male pattern balding genes would have been wiped out.

I wrote a post on baldingblog.com many years ago where I discussed causes of balding from an evolutionary point of view and the discussion covers the theory of balding in men. See here: https://baldingblog.com/2007/05/04/why-does-the-back-and-sides-of-the-head-not-lose-hair/