Discuss the relationship between genes and the products of gene expression.
The relationship between a gene and the produce produced by gene expression is the 'one gene-one polypeptide' hypothesis. This means that each gene codes for one polypeptide. A protein that consists of two or more polypeptide chains, e.g. haemoglobin will have a gene for each polypeptide cahin (alpha haemoglobin and beta haemoglobin). However, some genes code for RNA molecules and are not translated into proteins and some sections of DNA called introns (used to be called 'junk' DNA) are non-coding and have no corresponding polypeptide.