Your question is about the genetic traits that cause people to grow taller (compared to other people in that area). And the genetic selection of said traits.
I do not think it is only to do with genetics but also the environment. Such an influence lowers the selection of the genetic traits. So if you are taken care of well as a kid: Low stress, inspiring education, sports, good food (i.e. not too much as well) you grow taller. My son of 14 is already taller than me or my wife.
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