You should be calling it a lactose intolerant system in that case. It is a lactose intolerant system with a broken switch which results in tolerance. I am stating it is a lactose metabolizing system which is normally switched off in the adult, but through environmental influences is switched back on. It may look like a mistake, but it is computed and the "mutation" is targeted, thus the appearance of convergent evolution in the isolated populations.
That's fine. Whatever works for you.
"I am stating it is a lactose metabolizing system which is normally switched off in the adult, but through environmental influences is switched back on. It may look like a mistake, but it is computed and the "mutation" is targeted, thus the appearance of convergent evolution in the isolated populations."
Yes, an IF, AND, THEN system that 'designed' itself independent of the properties of the matter it consists of. Never observed but always assumed.