How do you define the word Evolution?

I was talking about loss of function between the MC1R gene and the agouti-signaling protein.
They are talking gain/loss of function as it relates to coat colour..
Dominant/recessive does not determine gain/loss of functional information. A normal light switch can be turned on or off. A broken light switch can result in a light permanently on (dominant) or permanently off (recessive); but the switch is broken in either case. Similarly with the MC1R gene. Edited by CRR, : Changed subtitle

They probably should be considered as two separate populations with gene flow between them.

Not quite. The population will still be subject to the same selection forces even after it has adapted to the environment, however these will tend to stabilise the population rather than change it. Both population groups will move towards equilibrium for their environment, which is why for H-W Equilibrium they should be considered as separate groups. However since the groups interact where the habitats meet there will also be gene flow between the two which will interfere with equilibrium being reached.Edited by CRR, : Changed subtitle

How do you define the word Evolution? ⇒ Reply

I quite like this as a definition of the word evolution. A bit wordy but adequate. It does however miss neutral theory so I would prefer [Biological] evolution is heritable change in a population over time.This is for the Word evolution as opposed to the Theory of Evolution