| libellule said: rocketpig, I dont see why an interesting character would disappear if it improves the selective capacity of the owner whatever the population is large or small.. Of course, in a large group, the % of individu having the new allele will increase slowly compared to smaller group but it is not a problem to my eyes. The only thing I can imagine is that the probability to have homozygote individu will be increased in smaller group allowing maybe a better selection of these individu. |
I suppose it could happen in a larger population but from what I learned, it almost always happens in a smaller population. The problem I see with a larger population is that it would be impossible to split into separate species with such a large gene pool crossing over. Apply it to dogs... Purebreds often have degenerate conditions, skin problems, etc. because the gene pool is so small that recessive traits become widespread with inbreeding. Compare that to a mutt, where almost all recessive genes are neutralized by mating with another breed that has dominant genes to maintain the survivability of the animal.
Reverse that and I think you'll see what I'm talking about. BTW, what I have been saying mostly applies to the creation of a new species, not a single trait that helps a species better adapt to its environment (longer teeth, more functional appendages, etc.). That can happen over time in a larger population, though even then a smaller population is better suited to allow it to spread quickly and become dominant.
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