Our genes, which are sequences of DNA or RNA, make us human. Our genes encode molecules that have specific purposes. For example, some genes encode things such as the color of our eyes or our height. Genes produce proteins that direct all the pathways in our bodies. Certain proteins, like those in our hair and skin, can be seen. However, other proteins control functions inside of our body. Throughout most of the body, every cell has the same genes. Yet, within each of the different cells, some genes are active while others are not. When active, genes can produce proteins; this process is known as gene expression.
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