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Just because something can change later in life doesn't mean it isn't genetic.
Proof of this: baldness.
The most common variety, Androgenic alopecia, is beleived to be caused by a genetic propensity towards certain hormone production later in life which is believed to be on the X chromosome.
At the same time, there are forms of genetically-induced alopecia which cause baldness from birth onward.
Then there is a range of genetically-induced alopecia in both of these scenarios.
Even still, there are environmentally induced alopecias which can mimic the same end results as these genetically-induced types of alopecia.
Just because there is evidence of a change for some people later in life doesn't rule out a genetic cause for that change.
Just because there is evidence that there is a change later in life for some people, doesn't mean that the root cause is the same for all people.
Proof of this: baldness.
The most common variety, Androgenic alopecia, is beleived to be caused by a genetic propensity towards certain hormone production later in life which is believed to be on the X chromosome.
At the same time, there are forms of genetically-induced alopecia which cause baldness from birth onward.
Then there is a range of genetically-induced alopecia in both of these scenarios.
Even still, there are environmentally induced alopecias which can mimic the same end results as these genetically-induced types of alopecia.
Just because there is evidence of a change for some people later in life doesn't rule out a genetic cause for that change.
Just because there is evidence that there is a change later in life for some people, doesn't mean that the root cause is the same for all people.
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