Assertion: mutation's effect | /r/HasProperty | negative
Facets:
value: on occasions
type: TEMPORAL
value: in a given environment
type: LOCATION
Source sentences:
text: sometimes it's a one-off that produces effects that don't breed true, or are so negative that they prevent the individual mutant from successfully surviving and breeding.
text: Although mutations that cause changes in protein sequences can be harmful to an organism, on occasions the effect may be positive in a given environment.