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Genetics is defined as the study of heredity and the variation of inherited characteristics. In every one of our cells, there are 46 strands of DNA that are tightly coiled into a chromosome. Within each chromosome, it is estimated that we have between 20,000 and 25,000 genes. For the most part, genes are the same in all humans, but a small number of genes are slightly different for each individual. These small differences are what make you who you are and unique from everyone else.