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DNA

DNA

DNA (deoxyribonucleic acid) is a substance containing genetic information that is found inside the center (nucleus) of most body cells. DNA determines what features a person inherits from his or her parents, such as blood type, hair color, eye color, and other characteristics.

Chromosomes are parts of body cells that carry the DNA. The DNA of each chromosome is divided up into genes. Each person's DNA contains tens of thousands of genes.

Changes (mutations) can occur in the DNA of genes or chromosomes. These changes may be harmless and undetectable. Or the changes may affect certain body processes or functions to cause genetic conditions, such as hemophilia, cystic fibrosis, or Down syndrome.

Current as of: March 12, 2014

Author: Healthwise Staff

Medical Review: Kathleen Romito, MD - Family Medicine & Siobhan M. Dolan, MD, MPH - Reproductive Genetics

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.

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