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Trinucleotide Repeats: Fragile X Syndrome What are trinucleotide repeats? DNA is the chemical that makes up your genes. It contains a "code" of 3-letter words known as codons or trinucleotides. Many genes normally contain trinucleotide sequences that repeat. These are called

Uniparental Disomy: Prader-Willi Syndrome and Angelman Syndrome What is uniparental disomy? Chromosome pairs affect how our body works. Normally, a baby gets one copy of each chromosome pair from each birth parent. In rare cases, two copies come from the same parent. This is