gene

A string of the DNA (deoxyribonucleic acid) molecule that is the fundamental unit of inheritance, so it is variations in the make up of this molecule in the genegene A string of the DNA (deoxyribonucleic acid) molecule that is the fundamental unit of inheritance, so it is variations in the make up of this molecule in the gene that controls variations in an organism's appearance and behaviour. Genes are found in the nucleus of the organism's cells. that controls variations in an organism’s appearance and behaviour. Genesgene A string of the DNA (deoxyribonucleic acid) molecule that is the fundamental unit of inheritance, so it is variations in the make up of this molecule in the gene that controls variations in an organism's appearance and behaviour. Genes are found in the nucleus of the organism's cells. are found in the nucleus of the organism’s cells.