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DNA
Deoxyribonucleic acid (DNA) is a nucleic acid which carries genetic instructions for the biological development of all cellular forms of life and many viruses. DNA is sometimes referred to as the molecule of heredity as it is inherited and used to propagate traits. During reproduction, it is replicated and transmitted to offspring.
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DNA Learning Ceter (Cold Spring Harbor)
Features a brilliantly executed 32 chapter presentation (DNA From the Beginning) on genetics and DNA that is detailed enough without being too advanced for the average audience. Includes great animations, photo galleries, sound clips and more. The Eugenics section is also phenomenal. The DNA secret messages section offers an excellent animation on how DNA is analyzed. Also a Features section with more good articles on genetics and a links section.