Assertion: hybrid necrosis | /r/CreatedBy | recessive alleles
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Source sentences:
text: These early studies established several important points: that hybrid necrosis can be genetically simple, that it can be caused by recessive alleles (Phaseolus), or dominant alleles (Crepis, Gossypium, Nicotiana and rye), and that it can occur either within (Gossypium, Phaseolus and rye) or between (Crepis and Nicotiana) species.