Medicago tuberculata WILLD. includes right-handed and left-handed races. Reciprocal crosses were carried out with the following results.1. Right dominates over left.2. Reciprocal F1-hybrids are identical.3. In F2 simple segregation takes place.4. A considerable deficit of L-plants was observed in F2 when the female parent of the cross was left-handed.
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LILIENFELD et al. (1956) studied this question.