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The Mutations of chromosome 15 that can cause disease Chromosomes are found everywhere. They are made in the nucleus. The genetic materials in a nucleus are made up of Deoxyribonucleic acid (DNA), which is the main ingredient and protein. 1Structure of a Chromosome A chromosome is a long coil of DNA, which is made up of genes, a unit of hereditary information. Chromosomes are arranged in pairs of homologous chromosomes where every animal and plant cells have their own number of chromosomes, called their diploid number. A chromatid is one of the two arms of a chromosome, which are joined by the centromere. Humans have 46 chromosomes. 1 Illustration of the placement of genes in a chromosome. Genes are composed of a section of deoxyribonucleic acid (DNA). They act as a certain sequence of base pairs that codes for a certain trait/characteristic. As you can see above, every chromosome contains many genes. Nucleic acids are found in a cell’s nucleus, which are responsible for storing and transferring genetic information. There are two types of nucleic acids; Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA). DNA contains the genetic information carried by every cell and guides the activities f