This is the work of the population geneticist. Population geneticists are interested in gene flow, immigration and emigration, the effects of disruptions in populations and how these events influence the frequency of a trait in a given group of individuals. At the broadest level, evolutionary geneticists and genomicists examine how the sum of the genes in a species, also called the genome, changes over long periods of time. The past decade has seen a tremendous focus on this level of genetics as new technologies and computer applications have allowed the generation and study of large databases of genetic information. Genetics is the study of inheritance. It is a broad science that examines the molecular basis of inheritance at the cellular level, the transmission of traits from generation to generation, and the movement of genes within and between populations. As a science, genetics is both very young and very old. It has only been in the past 50 years that we have discovered the structure of the molecule that carries our genetic information from generation to generation. That molecule is of course deoxyribonucleic acid, or DNA. Yet despite the fact that we have only been studying DNA for a short period of time, the study of genetics now permeates all aspects of the scientific world and our lives.
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