Assertion: mutation's gene | /r/HasProperty | diﬀerent alleles
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Source sentences:
text: Genes for tongue rolling and non-rolling are diﬀerent alleles, for example, but genes for tongue rolling and genes for making hemoglobin are diﬀerent genons, with genes for normal and sickle cell hemoglobin as alleles of the hemoglobin genon.