Assertion: mutation's gene | /r/CapableOf | build up to high levels
Facets:
value: in some abstract sense
type: MANNER
value: in certain african populations
type: LOCATION
Source sentences:
text: The gene for sickle-cell anemia has built up to high levels in certain African populations, not because it is “beneficial” in some abstract sense, but simply because the death rate from anemia in those areas is less than the death rate from malaria.