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Why is the Prader-willi syndrome recessive?

Updated: 8/20/2019
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11y ago

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Prader-Willi Syndrome is neither dominant or recessive - it is simply a genetic anomaly that occurs at conception (it's not inherited - it just happens) where part of the 15th chromosome that should be present/active is missing. This occurs either because it is totally missing (known as a deletion) or because the child gets 2 chromosome 15s from the mother (instead of 1 from mom and 1 from dad which is the way it should be) and therefore that part of chromosome 15 that should be active from the father is nonexistent (this is known as uniparental disomy).

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Q: Why is the Prader-willi syndrome recessive?
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