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molecular genetics
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Molecular genetics is the scientific study of genes at the molecular level, examining how DNA and other molecules work to control living organisms. It matters because understanding how genes function at this fundamental level helps us explain inheritance, disease, and the diversity of life itself.
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Molecular genetics is a branch of biology that addresses how differences in the structures or expression of DNA molecules manifests as variation among organisms. Molecular genetics often applies an "investigative approach" to determine the structure and/or function of genes in an organism's genome using genetic screens.
The field of study is based on the merging of several sub-fields in biology: classical Mendelian inheritance, cellular biology, molecular biology, biochemistry, and biotechnology. It integrates these disciplines to explore things like genetic inheritance, gene regulation and expression, and the molecular mechanism behind various life processes.