Human behavior is defined as the response of individuals or groups of humans to internal and external stimuli. The attitude he generates towards a particular situation, that reaction is known as his behaviour. Our lives are bound within eachother. We either grow by influence of environment or use our inherited traits to help us deal with the world. The genetics and the environment play a key role in influencing human behaviour. Genetics is the inherited genes. The behavioural genetic research team supports the heritability not the genetic determination of our behaviour, but still the main factor in keeping a man alive is his intelligence that somehow is an inherited ability. The intelligence quotient or IQ of a man distinguishes him in dealing when faced with a problem or situation. How cleverly he figures out the result, that trait is adopted in him by his ancestors and that marks his place in the group of people, either the black sheep or the leader of the flock. It is his genes not depending on where or which side it came from but his social traits and intelligence are the result of it. The environmental factor on the other hand is another great cause for a man’s behaviour. A child will first act as he’s treated at his place. He’ll behave how his parents, siblings, and relatives treat him. Then on joining other kids and getting social interactions he’ll start developing an attitude of his own. He will show his own response to a situation. A person living in a city is civilized, modern, educated and out looking as compared to a person from a small town for whom women comparing themselves to men is the most absurd thing he’ll see. He still has this concept in his mind that cell phones and science are nothing but mere curse. On the other side, people from a city, they value and observe modernization and use science in dealing with every aspect of life. Humans are the most complex creation as they have millions of aspects which need hundreds of years to be studied. But speaking scientifically or genetics and environment influence our human behavior and generate differences among us. Published in Daily Times, January 16th 2019.