在隔离区内,假设一个玉米群体的所有优良表型性状都由显性基因支配,需要逐代淘汰隐性性状时,在姊妹交的自我繁殖过程,群体中显性基因所支配的表型性状,在F_n代时,应有下列一些遗传规律。以两对基因为例: 设基因型为AAbb和aaBB的亲本组合,在F_1中产生AaBb的基因型群体,即可利用 Within the isolation zone, assuming that all of the excellent phenotypic traits in a maize population are dominated by dominant genes, the recessive traits need to be phased out one-by-one, during the self-reproduction of sisters, phenotypic traits dominated by dominant genes in the population , In the F_n generation, there should be some of the following genetic law. Taking two pairs of genes as an example: Assuming that the genotype is a parental combination of AAbb and aaBB, a genotype population of AaBb is generated in F_1