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【单选题】
由三种不同籽粒颜色的玉米,第一种是红的,第二种是白的,第三种也是白的,但若在成熟期暴露在阳光下就变成红的。试问第三种玉米的颜色是由那种因素决定的?下列哪一个答案是正确 。A.
遗传
B.
环境
C.
遗传和环境
D.
既不是遗传也不是环境
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A.
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