Prader-Willi, which comes from a deletion or repetition ... "There's a tendency here to reward kids for being good with candies," he observes. "But people don't realise that one sweet here ...

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Bedard, Kasey E. Pacha, Destiny Griffith, Annette K. and Ward, Stacy 2024. Prader-Willi Syndrome: A primer for school psychologists. Children and Youth Services Review, Vol. 163, Issue. , p. 107775.

We each get two copies of every gene - one copy from each of our parents. But what happens when one of these genes has been "turned off", or imprinted, and the remaining gene is defective?