Assume the following scenario:
A great disaster befalls the planet, apparently killing everyone except a 20 year old British man named Adam and a 18 year old British woman name Evelyn. (but we'll call her Eve for obvious reasons)
Adam and Eve wander England for a while and finally come to the realization that they could be the last humans on earth, as before the TV and radios went out there were reports from BBC World that all of "the new world" was destroyed, but before the Arabs could laugh too hard, so was virtually every other country, even as close as Ireland and Iceland, but remarkably the UK was left untouched - brill.
Despite all electricity gone and millions of dead brits and scots lying in their respective streets/homes, most buildings have been left untouched including supermarkets and shopping malls. Adam and Eve figure they have a good chance of surviving for a few years on the rations, not to mention a nearby paddock has some cows. (convenient huh?)
Anyway, Adam and Eve after clearing a couple of hundred dead corpses from their main holdout (a shopping mall) and burning the bodies on a pyre, decide to repopulate the earth.
They are both white of English stock and not related (that they know of) and after their first child is born "Adam 1" it seems they can breed.
Adam and Eve (hereafter known as Adam 0 and Eve 0) have a total of 6 children, 1 per year before they decide to cool it for a while. (she's tired)
A few years pass and Adam 1 (the firstborn) is 20, Eve 1 (the 2nd born) is 19, Adam 2 = 18, Eve 2 = 17, Adam 3 = 16, Eve 3 = 15.
Adam 0 is now 40, Eve 0 is now 38 - and they know the next step unfortunately is some form of incest, problem is both of them aren't scientists so they don't know who should breed with who to avoid any unecessary homozygocity - ie- keep birth defects both mental and physical to a minimum.
Q. Who breeds with who now, and why?
(eg. Is it preferable for a son to impregnate the mother, the father to impregnate a daughter, or is it better that the brothers and sisters only breed within themselves without parents? Also does age make a difference in any of this?)
