In any population there is a lot of variation which can be caused by genes, environment, or both.
One thing that was originally thought to be an environmental characteristic, is now seen as a genetic one too.... OVEREATING
-At first people thought overeating was only caused by increased availability of food
- Eating releases dopamine which makes people stop eating, but one allele produces 30% less dopamine than another, so overeating can be caused by genes.
Another example of a mix between genes and environment is HEIGHT. Someone could have the genes to be six feet tall, but if they have the wrong diet, they could only grow to be five feet five inches.
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