How are animal behaviors and gnes related?

Answer 1

Let us use an example.

Dopamine receptors in the brain are influenced in variance amounts by the genes recipe for brains, modulated by development and the environment. That is some people have more, or less dopamine receptors in their brain. Dopamine is a reward neurotransmitter and its effect is modulated by the amount of receptor sites it has. They have found that those with very few receptor sites take more reward giving risks to keep the level of dopamine high in their brains; to feel the reward. Those with normal numbers of receptors do not show such risky behavior on average.

Thus, genes have this to do with these peoples behavior and this illustration just shows a little piece of this puzzle.