Summary
Highlights
DNA, or deoxyribonucleic acid, is the chemical foundation of all genetic material. It's a polymer made of two strands forming a double helix, and if unraveled from a single cell, it would stretch over 2 meters.
To manage its length, DNA is organized into 46 tightly coiled sections called chromosomes. We have 23 pairs of chromosomes, one from each parent. The 23rd pair consists of sex chromosomes (XX for females, XY for males). Chromosomes typically appear as an 'X' shape only before cell division, otherwise resembling a more relaxed structure.
A gene is a small segment of DNA that codes for a specific protein. These DNA segments provide instructions for a particular sequence of amino acids, which then combine to form thousands of different proteins. The proteins produced determine the cell's function and type, such as hemoglobin in red blood cells or proteins for muscle contraction.
The genome refers to the complete set of genetic material in an organism. Scientists have mapped the entire human genome, which helps identify genes linked to diseases, either causing inherited conditions or increasing risk. This knowledge aids in developing more effective treatments and allows for tracing human ancestral migrations through small genetic differences between populations.