For evolution to occur, there must be a selective value for any trait.
2.
But eventually they may in turn become, in changed conditions, of selective value.
3.
:: : I wasn't proposing a purpose, I was wondering what the selective value to such a trait would be.
4.
The selective value of a little greed is obvious, just as the selective value of a little altruism ( but not too much ) is obvious.
5.
The selective value of a little greed is obvious, just as the selective value of a little altruism ( but not too much ) is obvious.
6.
Thus in many cases the difficulty of supposing that selection has acted on minute and imperceptible initial variations, so small as to have no selective value, may be got rid of.
7.
An imperceptible physiological difference might be of selective value, and it might carry with it correlated variations that may or may not appeal to the human eye, but are of no selective value themselves.
8.
An imperceptible physiological difference might be of selective value, and it might carry with it correlated variations that may or may not appeal to the human eye, but are of no selective value themselves.
9.
The reflex may also have had selective value by having the sleeper readjust or review his or her sleeping position in a nest or on a branch in order to assure that a fall did not occur ."
10.
It is the net selective value of a gene's phenotypic effect that determines the fate of the gene . " For instance, a gene can cause its bearer to have greater reproductive success at a young age, but also cause a greater likelihood of death at a later age.
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