A gene product is the biochemical material, either RNA or protein, resulting from expression of a gene. The amount of gene product is used to measure how active a gene is. Abnormal amounts of gene product can be correlated with disease-causing alleles, such as the overactivity of oncogenes which can cause cancer. Ribonucleic acid (RNA) is a nucleic acid polymer consisting of nucleotide monomers. ... A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... This stylistic schematic diagram shows a gene in relation to the double helix structure of DNA and to a chromosome (right). ... A disease or medical condition is an abnormality of the body or mind that causes discomfort, dysfunction, distress, or death to the person afflicted or those in contact with the person. ... An allele is any one of a number of viable DNA codings occupying a given locus (position) on a chromosome. ... An oncogene is a modified gene that increases the malignancy of a tumor cell. ... Cancer is a class of diseases or disorders characterized by uncontrolled division of cells and the ability of these cells to invade other tissues, either by direct growth into adjacent tissue through invasion or by implantation into distant sites by metastasis. ...

In other words, a gene product is a physical characterstic, such as hair color, eye color, skin pigment etc...