Answer:
sorry if my answer is incoplete.
Most cases of Prader-Willi syndrome are not inherited, particularly those caused by a deletion in the paternal chromosome 15 or by maternal uniparental<span> disomy. These genetic changes occur as random events during the formation of reproductive cells (eggs and sperm) or in early </span>embryonic<span> development.</span>
Answer:
1. DNA and RNA I'm pretty sure
