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生命是从单个细胞(受精卵)开始的。受精卵发育首先是经过一系列的细胞分裂,细胞数目增加,同时进行细胞分化。细胞通过分裂,将复制的遗传物质平均地分配到两个子细胞中。细胞分裂的方式有三种:①无丝分裂(amitosis)又称直接分裂;②有丝分裂(mito-
Life begins with a single cell (fertilized egg). Fertilized egg development is first through a series of cell division, cell number increased, while cell differentiation. Cells split through to divide the replicated genetic material evenly into two daughter cells. Cell division in three ways: ① amitosis (amitosis), also known as direct division; ② mitosis (mito-