Russ Tanner wrote:

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For example, if father works hard physically or spends a lot of time in the sun, he will tend to have children who are bigger or more tan

Uh, no he won't. Just look at Australians, the bulk of whom are of Anglo-Saxon descent. They have a huge skin cancer rate. Why? Because they haven't spend TENS of THOUSANDS of years evolving in the harsh, sunny clime of Australia. Instead, their ancestors had spent an equally long time evolving to the climate of the British Isles. Your father character in the scenario above, should he be an Anglo-Saxon in Australia, can spend as much time as he wants in the sun and work as hard as he wants all day. He will still not sprout a bunch of tan, muscle-bound children. Heck, he won't even get tan himself! He'll just burn.

Be that as it may, if I were to apply the same logic you have applied above, would it not be possible, then, for an animal to continue to "adapt" more and more until he's so far removed from the original "hard working, tan father" as to be a completely different species? If not, how much, exactly, can a species change before it will meet a dead end and can change no further? Additionally, could you explain how you believe the different races are they way they currently are? Do you believe that your gods made them this way or that they "adapted" to the environment instead (by working hard or spending a lot of time in the sun, etc.)?