It is said that genes are partly responsible for the choices we make in our life; our genes help to create our environment, and then that environment can influence our personality. So, beside genes, what else is responsible for the other choices? Is there something else at work?
Answer
Many genetic studies in this area have found that variation in serotonin receptors associates with differences in a number of personality traits. That one gene, or a very small number, turns up time and time again for something so complex as human personality makes me a bit suspicious.
Other factors at play: Family dynamics
Culture and cultural norms
Society and societal norms (these could clash with the above two)
Exposures - drugs, toxins, diet, and many others
Traumatic events
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