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"Invariant traits --
such as having
five fingers to a hand instead of four or six -- don't become universal
because Nature has somehow selected special genotypes that faithfully
direct development of the trait under a wide variety of conditions, the
researchers argue. Instead, they show, it is the complexity of our
genotypes -- the many genes that interact in networks during
development, inhibiting and activating each other and even regulating
themselves -- that provides fidelity. Any functional genetic network
that is complex enough has this built-in property of fidelity. This is
true whether natural selection on the phenotype produced by the network
during development is strong, weak or absent." (adapted from Stanford Report, August 7, 2002) |
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