What are DNA and Genes? - learn.genetics.utah.edu
Contained within the 3 billion letters of the human genome are about 21,000 genes. Most of our known genes code for proteins, but some code for RNA molecules. All humans have the same genes …
What Are Genes, DNA, and Chromosomes? - Verywell Health
Oct 27, 2025 · Our genes are made up of DNA, a molecule with this coded information. Hundreds to thousands of genes are found on each chromosome inside our cells. 2 Together, the DNA, genes, …
What is DNA? Definition, Function & Structure - Cleveland Clinic
Jul 7, 2025 · Chromosomes: These are threadlike structures that separate your DNA into manageable chunks, like individual books of instructions in your DNA library. Genes: These are individual sections …
Genetics Basics | Genomics and Your Health | CDC
May 15, 2024 · A person's DNA includes many genes that have instructions for making proteins. Additionally, certain sections of DNA are not part of a gene but are important in making sure the …
What is DNA?: MedlinePlus Genetics
Jan 19, 2021 · DNA is a double helix formed by base pairs attached to a sugar-phosphate backbone. DNA is the hereditary material in humans and almost all other organisms. Genes are made up of DNA.
Gene | Definition, Structure, Expression, & Facts | Britannica
Dec 4, 2025 · Genes are composed of deoxyribonucleic acid (DNA), except in some viruses, which have genes consisting of a closely related compound called ribonucleic acid (RNA). A DNA molecule is …
1: DNA, Genes, Chromosomes and Genome - Biology LibreTexts
DNA is organized into genes, the functional units of heredity, which guide the production of proteins that determine the structure and function of cells. These genes are meticulously arranged on …
What Is the Difference Between DNA and a Gene?
Aug 16, 2025 · A gene is a specific segment of DNA located at a particular position on a chromosome. Unlike the entire DNA molecule, each gene carries the precise instructions for a particular function or …
Genes and Chromosomes - Fundamentals - MSD Manual Consumer …
Genes consist of deoxyribonucleic acid (DNA). DNA contains the code, or blueprint, used to synthesize a protein or a ribonucleic acid (RNA) molecule. Genes vary in size, depending on the sizes of the …
Genes and DNA: Understanding the Relationship - Genetics
Dec 20, 2023 · Genes are specific segments of DNA that contain the instructions for protein production, while DNA serves as the molecule that carries and transmits genetic information.