下图表示人的生殖和胚胎�育过程.请据图回答.1a是睾丸d表示受精 过程人体�育的起点是受精卵.2人的体细胞有23对染色体b的 Template




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tomski下图表示人的生殖和胚胎�育过程.请据图回答.1a是睾丸d表示受精 过程人体�育的起点是受精卵.2人的体细胞有23对染色体b的 coloring