The first division of zygote is transverse and forms a basal cell and an apical cell. The basal cell does not divide, but increases in size, acting as a unicellular funiculus, while the apical cell divides many times.
合子的第一次分裂是横向的,形成的基细胞不再分裂,体积增大后充当一个大的胚柄细胞。
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