Biology Question.

[Trytostaydead]

Or for that matter, look at antibiotic-immune organisms. Stop feeding your crop animals boatloads of antibodies, then very quickly most of those immune organisms became very vulnerable again. But that's more of an example of spontaneous mutation really as opposed to carrying a heterozygous trait. But the principle applies, as the non-immune state of the resistant organism is actually the most fit for them it quickly reverts if just one or more colonies sprout up in the absence of antibiotics. Whereas, say the tallness gene might confer some type of greater selection, it could come back within a few generations.

[Admiral Valdemar]

Or for that matter, look at antibiotic-immune organisms. Stop feeding your crop animals boatloads of antibodies, then very quickly most of those immune organisms became very vulnerable again. But that's more of an example of spontaneous mutation really as opposed to carrying a heterozygous trait. But the principle applies, as the non-immune state of the resistant organism is actually the most fit for them it quickly reverts if just one or more colonies sprout up in the absence of antibiotics. Whereas, say the tallness gene might confer some type of greater selection, it could come back within a few generations.

Evolutionary economics. This is why we don't have cheetahs chasing gazelles at Mach 2. There will always be a cost to any adaptation, same with the likes of C4 plants that are better adapted to low water conditions but are less efficient in other areas a normal C3 plant would be good in.

TANSTAFL - There Ain't No Such Thing As a Free Lunch.

[Elfdart]

Evolution doesn't reward you for being the very best, so much as being just good enough.