采用增广NCⅡ设计 ,对玉米株高、穗位进行了遗传模型测验。结果表明 :玉米株高不符合加性—显性模型 ,存在极显著显性效应和上位性效应 ,穗位符合加性—显性模型。增效、减效等位基因频率在雌、雄间的分配 ,株高差异显著 ,但穗位无明显差异。株高的遗传为超显性遗传。穗位的遗传为部分显性 ,隐性为增效基因。 By using augmented NC Ⅱ design, genetic model tests were conducted on plant height and ear position of maize. The results showed that: corn plant height does not meet the additive - dominance model, there is a significant significant effect and epistatic effect, ear position consistent with additive - dominance model. Synergistic, allelic allele frequency in the female and male distribution, significant differences in plant height, but no significant difference in ear position. Height of the hereditary genetic super dominant. Spike position of the inheritance as part of dominant, recessive as synergistic genes.