What are genes? How do they work? Genes are an essential part of all living things. They are segments of DNA molecules that are found in cells. Genes determine the traits of an organism, such as its shape, color, and response to stress. Structure of genes Genes are made up of DNA molecules. DNA is a nucleic acid that contains a code. This code tells the cells what to do. How genes work Genes work by providing instructions for the production of proteins...
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