Steve Schaffner wrote:
"Dylan" writes:
.. . . .

No, that's not what he means. Blind cave fish *might* have lost
their
sight because blindness made them more fit, e.g. if they were able to
redirect some resources previously used for vision. But they might
also have lost their sight because their fitness became independent
of
whether they had sight or not. If a trait does not confer greater
fitness, there is an excellent chance that it will disappear because
of random mutations.

--
Steve Schaffner

.. . . .

Suppose a population of fish gets trapped in a large cave with a large
body of water in complete darkness. At first they are all sighted. But
over time a blind percentage develops. Then, over more time, a
percentage of the blind percentage develops antennae that help them
better find food. Suppose, further, that at some point in time there
are three subpopulations of equal size: original sighted, evolved
blind, and further evolved blind fish with antennae. Now my questions:

1. Which subpopulation shows the greatest "survival of the fittest"?

2. Which shows the least?

3. And why?

Thanks in advance,

Dylan
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