Gene is a functional segment on the DNA molecule, is the basic unit of genetic information, is to determine the most basic factors of all biological species; genes determine human life, old age, disease and death, is the cause of health, beauty, longevity, is the manipulator and regulator of life. Therefore, where there is life, where there are genes, the existence and demise of all forms of life are determined by the genes, including your looks, height, weight, skin color, personality, etc. are inseparable from the genes. Genetic testing is a technique that tests DNA through blood, other body fluids, or cells. Genes are DNA or RNA sequences that carry genetic information (i.e., genes are segments of DNA or RNA that have a hereditary effect), also known as genetic factors, and are the basic units of inheritance that control traits.