The environment and our genetic make-up is what defines our outlook and behaviour towards one another. There are some characteristics within each of our behavioural outlook, that sets one individual apart from another. So, what are the key markers that distinguish one individual from another?

It must also be remembered, that even two twins, with a similar genetic profile, do not have the same characteristic behaviours.

Some genes are more widely expressed in a specific tissue/organ. For example, when it comes to behaviours, the genes predominantly expressed within the brain must be studied, albeit in a blood sample.

I can explain this with the instance, when some athletes are more competent that others. There is a certain genetic make-up of their muscles, the bones, and the structures that support a strong muscular system, which sets them apart from other incompetent athletes. The stamina, the endurance, the ability of one athlete being more capable than another, is defined by a set of genes within the muscles and the structures that support a healthy muscular system, of that competent athlete.

What are the other possible factors that define specific behaviours?