The population must be infinitely large!
Hope this helps!
The possible result of the founder effect would be loss of genetic variation. The reason why this is so is because by definition, the founder effect is often considered to be the cause for a essened genetic variation in a specie or a certain area where organisms thrive.
It rains or snows outside (precipitation)
Water that forms from a mixture of heat and cold (condensation)
The sun heats up the water and it turns to vapors and goes into the air
(Evaporation)