摘要:57.下列符号代表精子的染色体.a和a′.b和b′.c和c′为同源染色体.下列来自同一精原细胞的精子是 ( ) A.abc′.ab′c.ab′c.abc B.a′bc.ab′c.ab′c.a′b′c′ C.ab′c′.a′bc.a′bc′.abc D.ab′c.a′bc′.ab′c.a′bc′

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