Assertion: genotype's allele | /r/HasProperty | rare
Facets:
value: very
type: DEGREE
Source sentences:
text: For other genes, one allele may be common, and another allele may be rare.
text: Both these alleles are very rare.
text: Both dominant and recessive alleles can be extremely common or extremely rare.
text: For other genes, one allele may be common, and another allele may be rare.