Student or Learner
Does the "should" in "alternative strategies (should) not persist in a population" mean presumption or original meaning of "responsibility"? I can't understand the whole underlined part. Is the writer saying that they, the fish should stop alternating in eating either on the left or right?
ex)A scale-eating cichlid fish has two forms, one that eats scales off the right side of its victims and one that eats scales off the left side. Individual fish inherit the strategy and mouthparts twisted in the appropriate direction; they cannot switch between the alternative strategies by feeding sometimes on the left and sometimes on the right. Ordinarily, alternative strategies (should) not persist in a population, because if one strategy bestows even slightly higher fitness, it should increase in frequency relative to the other until only the better strategy remains.
it should increase in frequency relative to the other until
Does alternative strategy mean "you can choose left-feeder or right-feeder whenever you want?" or "just stick to one side"?
Last edited by keannu; 05-Sep-2011 at 07:40.