Geneticists are scientists who study the properties and mutations of genes. They determine and research genes, heredity, and variation in living organisms. Geneticists work in labs, conducting experiments or researching data; prepare scientific literature and articles; and write grant applications. Sometimes, geneticists will perform field work to collect data. In recent years, independent businesses have started mail-order genetic testing to discover health issues, finding relatives, and building a family tree with accurate ancestry. Geneticists are the ones who test these genes and analyzes the results.