1. The union of male and female gametes to form a zygote. 
   受精卵雄性和雌性配子的结合形成受精卵
2. fertilization by the union of male and female gametes from the same individual. 
   由同一个体花粉或精子实现的受精。
3. reproduction involving the union or fusion of a male and a female gamete. 
   由雄性和雌性结合体相结合或融合而进行的繁殖。
4. Occurring or reproducing without the union of male and female cells; asexual or parthenogenetic. 
   无性的不经过雄性和雌性细胞结合而产生或繁殖的；无性的或单性生殖的
5. fertilization by the union of male and female gametes from different individual of the same species. 
   同种的两个不同个体的配子间的受精。

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