How do chromosomes carry genetic information?

Chromosomes carry genetic information by serving as the structural framework for DNA, the molecule that encodes the instructions for life. Within eukaryotic cells, chromosomes consist of DNA tightly coiled around a core of proteins, primarily histones, to form a complex known as chromatin.1234

The genetic information itself is organized into functional units called genes, each of which occupies a specific site, or locus, on a chromosome. This compact organization is essential; it allows long, double-stranded DNA molecules—which can measure up to two meters in length if unraveled—to fit within the microscopic confines of a cell nucleus.356

During cell division, this structure ensures that genetic material is accurately organized, replicated, and segregated into daughter cells. By acting as a template, each strand of the DNA double helix allows for the precise duplication of genetic information, ensuring that the hereditary instructions are faithfully transmitted from one generation to the next.241