"Hereditary" refers to human nature. It is well said that "nature cannot be changed." Hereditary factors are the major habits and behavior transfers from parents and blood relations. Traits are passed on from one generation to another. For instance, a person with a reserved nature or an aggressive nature has difficulty as an employee. They both have interrelated influences.
Hereditary factors determine a person's temperament. This is what makes people seem so much like other people. There have been different classifications of temperaments offered for thousands of years, but there is general agreement that there are four basic temperaments. My favorite classification is that of Melancholy, Phlegmatic, Choleric, and Sanguine. Each person has a blend of two temperaments, one inherited from the father and one inherited from the mother. Environmental factors determine a person's personality with temperament forming the baseline characteristics of that personality. The environmental factors include everything from prenatal influences, the way a person is raised and the outside influences such as location, schooling, friendships, traumas or joys, religious instructions and experiences, political events, significant relationships, etc. They also include personal choices and their consequences. This is what makes everyone unique from everyone else. So, you could say that hereditary factors basically determine how we are like each other, and environment factors shape the hereditary foundation to make each of us unique and special in the world.
One reference is noted below, but there are many, many others. My answer above is based upon a conglomeration of many years of personal study of the topic.
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