On selfing or crossing heterozygotes some double recessives may appear, giving viable offspring. 在自交或杂交产生的杂合子中双隐性性状可以表现出来并产生可育后代。
Selfing is inhibited by genetic self incompatibility and also by the fact that within a single flower the stigma is receptive before the anthesis are ready to shed pollen. 由于遗传上的自交不亲和性以及花中柱头只能在花粉准备撒粉以前接受花粉，因而防止了自交。
