What is genetics?
Genetics is the science of heredity and variation in living organisms.
What is genomics?
Genomics is the study of the genomes , ie. the full set of genes or chromosomes, of organisms.
What is a gene?
A gene is the most basic unit of heredity. It consists of a relatively short sequence (several thousand nucleotides) of DNA at a specific location on a chromosome that determines a particular characteristic in an organism through the production of a specific protein end-product.