Abstract
In earlier studies the inheritance of chilling tolerance in maize was investigated using the joint scaling test on six genotypes forming a systematic genetic series - P1, P2, F1, F2, B1, B2. The values of some genotypes (P1, P2, F1) were overestimated by the model, while those of the other genotypes (F2, B1, B2) were underestimated. It was thought that this could be due to the effect of the level of heterozygosity in the female parent. The level of heterozygosity of the female parent in the P1, P2, F1 genotypes is 0%, while in the F2, B1, B2 genotypes it is 100%. In addition to the m, [d] and [h] parameters, a new parameter, [fh] (female heterozygosity) was thus introduced. Analysis carried out with the new model confirmed a significant female heterozygosity effect.
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