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Overview

Genes and Chromosomes

Genes are the tiniest piece of human information. They serve as the body's blueprint of heredity. Genes are made of DNA that are double stranded molecules (like beads on a string) of protein within our cells. These proteins contain four letter codes, A, G, C, T, that interlock to form different sequences. The body has about 25,000 to 30,000 genes. Together, they make up the plans that determine how the body will develop, grow and function.

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General Information

Frequently Asked Questions About Genetics Counseling Genetic Disorders About Genetic Services (Gene Tests - National Institutes of Health) (More)

The Body

Genes: The Body's Blueprint Chromosome Genes (More)

Symptoms and Tests

Gene Tests (National Institutes of Health) Genetic Counseling and Prenatal Diagnosis Neonatal Cystic Fibrosis Screening (More)

Staying Healthy

The Family Tree Pedigree My Family Health Portrait Planning for Pregnancy (More)

Additional information on Inherited Disorders and Birth Defects