Human development is affected by the biology of our body and our experiences and interactions that we go through. Our genes and the environment interact to produce who we are. Molecules and cells are the building blocks of development. The cells in our body performs different functions, which makes development possible. DNA contains instructions needed to tell cells what to do. RNA transfers the instructions to make proteins, which acts as receptors of signals in the brain. If RNA translates the wrong instruction from DNA, PKU could be the result, and children could become intellectually disabled. This all shows that biology is clearly a big role for human development. The roles that our body play cannot alone help a person to develop. Humans
