如图表示人的生殖过程请据图回答.1a是 它的染色体数目是体细胞的 .2b是 精子和a结合的部位是 .3已知人的有耳垂是由显性 Template




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tomski如图表示人的生殖过程请据图回答.1a是 它的染色体数目是体细胞的 .2b是 coloring