Final answer:
Diseases that arise when the 'active' copy of a gene is deleted and the other copy remains silent due to imprinting are characterized by uniparental disomy.
Step-by-step explanation:
The diseases that arise when the 'active' copy of a gene is deleted and the other copy remains silent due to imprinting are characterized by a phenomenon called uniparental disomy.
Uniparental disomy occurs when an individual inherits two copies of a chromosome from one parent and none from the other parent. This can lead to various genetic disorders and abnormalities. An example of a disease caused by uniparental disomy is Prader-Willi syndrome, where the active copy of genes on chromosome 15 is deleted or silenced.