Chromosomes are thin strands of DNA (deoxyribonucleic acid). In most cells, chromosomes are found in functional pairs in the nucleus. Humans have 46 chromosomes arranged in 23 pairs. Chromosomes carry genetic information in a molecule called DNA.
A type of cell division called mitosis ensures that, when a cell divides, each new cell produced has the same genetic information. A chromosome contains coiled strands of DNA (deoxyribonucleic acid). Our DNA is made up of many smaller sections called genes. The nucleus of a cell contains chromosomes composed of DNA molecules.
Each chromosome carries a large number of genes. What are DNA, genes and chromosomes?.