a hybrid produced by parents that differ only at two gene loci that have two alleles each
dihybrid详细解释
di.hy.brid n.Genetics （名词）【遗传学】 The hybrid of parents that differ at only two gene loci, for which each parent is homozygous with different alleles.而性杂种：只有二对染色体遗传基因的亲体杂交，每个亲体都是不同等位基因的结合体
