A 15-year-old female is diagnosed with Prader-Willi syndrome. This condition is an example of:

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Prader-Willi syndrome is an example of gene imprinting, which occurs when only one of the two copies of a gene is expressed because the other copy is "silenced" or turned off due to epigenetic factors. In the case of Prader-Willi syndrome, the paternal copy of certain genes on chromosome 15 is silenced, leading to various symptoms including insatiable hunger and obesity. It is not an autosomal recessive, autosomal dominant, or sex-linked trait.

A 15-Year-Old Female Is Diagnosed with Prader-Willi Syndrome