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Old 11-13-2006, 05:52 PM   #1
kevin mckay
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Join Date: Oct 2006
Location: Berkeley
Posts: 352
Default Evolution question

Please forgive my ignorance, but I am stumped.

1) How do we evolve if a negative trait does not kill us before we reproduce? For example if I have some genes that are maladapted to refined carbs but have already popped out a kid before it has killed me how is natural selection taking place even over say 20 generations? I mean how often do people really die of refined carb related illness before they can squeeze out a kid?

2) If we have been around for 2.5 million and grains have been around for 10k how much adaptation has taken place?

3) I guess I am asking is natural selection the only way we evolve or are there smaller feedback loops on like a cellular level. I just donít get it.
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