Assertion: wrangel island mammoth | /r/CapableOf | accumulate numerous genetic defects
Facets:
value: before their extinction
type: TEMPORAL
value: due to their small population
type: CAUSE
Source sentences:
text: Before their extinction, the Wrangel Island mammoths had accumulated numerous genetic defects due to their small population; in particular, a number of genes for olfactory receptors and urinary proteins became nonfunctional, possibly because they had lost their selective value on the island environment.