What are genes?
Genes are parts of DNA that contain the information necessary for the production of the proteins that make us up and enable the human body to function.
They are composed of sequences of four different types of nucleotides (A, T, G, C) whose length and order vary from one gene to another. We have an estimated 20,000 genes that code for proteins.
Parents pass their genes on to their children. Every individual has two copies of each of their genes. One comes from their mother, and the other from their father.