A section of DNA; the sequence of the plate-like units (nucleotides) in the center carries information.
Genetics is the study of genes — what they are and how they work. Genes are units inside a cell that control how living organisms inherit features from their ancestors; for example, children usually look like their parents because they have inherited their parents' genes. Genetics tries to identify which features are inherited, and explain how these features pass from generation to generation.
Link:
http://en.wikipedia.org/wiki/Introduction_to_genetics
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