受精卵
受精卵（zygote、合子）拉发育生物学中用来描述生物个第一阶段，此时渠只是一个单细胞。迭个词也会被较为宽松个运用拉经过最初几分裂后个细胞，虽然严格个讲迭一阶段应称为卵裂球（分裂球，裂球）。一枚受精卵通常是通过两个单倍体细胞——女性个卵子搭男性个精子通过受精结合拉一道，所形成个二倍体细胞。
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