Assertion: chromosome's copy | /r/HasProperty | lost
Facets:
value: partly
type: DEGREE
value: because of a gene mutation
type: CAUSE
value: because of a chromosomal change
type: CAUSE
Source sentences:
text: If the maternal copy is lost because of a chromosomal change or a gene mutation, a person will have no working copies of the UBE3A gene in the brain.
text: Prader–Willi syndrome occurs when the paternal copy is partly or entirely missing.