1. A spontaneous calcium spike coulprep the egg for fertilization without sperm,and a division mistake could let the egg split up without ever needing male D. N. A. At all.
自发性钙峰会让卵细胞自体受精，细胞分化信号出错 尽管未发生精卵结合 卵子开始分裂。
2. Parthenogenesis. A baby without a daddy.
单性生殖 没有父亲的孩子。
3. In humans, it's onlyever been theorized, but it was never proved.