人的红绿色盲是由X染色体隐性基因控制的,下图是某家族红绿色盲

人的红绿色盲是由X染色体隐性基因控制的,下图是某家族红绿色盲的遗传系谱图,图中一定不带致病基因的个体是

A.5号       B.6号        C.9号        D.10号

答案

B

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