To: muawiyah
Think areal hard ~ how does the critter know the pressures are there, and what does he do to adjust his genome? Where has anyone on this thread said genomes anticipate need? That is Lamarckianism -- rejected in the last century.
But all populations have variation, and all populations acquire new alleles through mutation. During any period of environmental change, the frequency of alleles in the population shifts to accommodate the change. If the necessary traits do not exist, the population goes extinct.
427 posted on
09/14/2006 6:55:06 AM PDT by
js1138
(Well I say there are some things we don't want to know! Important things!")
To: js1138
You just said "traits can emerge" that didn't already exist in the genome under "environmental pressure", and I'm disputing that "environmental pressure" causes previously non-existent traits to emerge.
Environmental pressure DOES NOT CAUSE changes in the genome.
To: js1138
Where has anyone on this thread said genomes anticipate need? That is Lamarckianism -- rejected in the last century. It might return in a new form. Science evolves too.
441 posted on
09/14/2006 7:14:26 AM PDT by
A. Pole
(Donald Rumsfeld: "There are a lot of people who lie and get away with it, and that's just a fact.")
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