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For over 20 years, the Learn. Genetics is one of the most-used science websites. Tens of millions of visitors come to our site each year to find the science and health information they’re looking for. Your support will help us keep Learn. Genetics free and available to everyone.

It will also help us develop new content for you. Please help us keep Learn. How do Scientists Read Chromosomes? Try your hand at organizing a profile of human chromosomes.

Certain genetic disorders can be diagnosed by looking at a person’s chromosomes. Are Telomeres The Key To Aging And Cancer? Protective tips at the end of our chromosomes get shorter as we age. What are dominant and recessive? The terms dominant and recessive describe the inheritance patterns of certain traits. But what do they really mean?