Perhaps the answer your looking for is, a tumor suppressor gene.
This is a simple calculation involving drug doses.
The solution is as follows:
(0.125 mg/tablet)(n) = 1.25 mg
n = (1.25 mg)/(0.125 mg/tablet)
n = 10 tablets
So a person needs to take ten 0.125 mg tablets of vitamin D to have that 1.25 mg dose.
Answer: This is called allopatric speciation. The species continue to evolve in the own way, adapting to their different conditions. The eventually become two different species adapted to each environment.
I think Androgens is the answer
