Genetics. Genetics (from the Ancient Greek γενετικός genetikos meaning "genitive"/"generative", in turn from γένεσις genesis meaning "origin"),[1][2][3] a field in biology, is the science of genes, heredity, and variation in living organisms.[4][5] Mendel observed that organisms inherit traits by way of discrete "units of inheritance".
This term, still used today, is a somewhat ambiguous definition of a gene. DNA from the Beginning - An animated primer of 75 experiments that made modern genetics. Genetics Animations. Learn.Genetics™ Genetics. Genetics.