The second meiotic division thus gives rise to two cells with the diploid number of chromosomes , one of which divides parthogenetically to form an cmbryo 在第二次减数分裂中上升为两个细胞包含双倍体的染色体数目,其中的一个分裂形成胚胎。
The pollen grain germinates on a special extension of the carpel , the stigma , and double fertilization results in a diploid zygote and triploid ( usually ) endosperm nucleus 花粉粒在柱头上萌发,双受精导致双倍体的合子和三倍体的胚乳形成。