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0.4x(6%3.7)÷0.2简便算法

b的频率=色盲基因总数2×女性个体数+男性个体数×100%=7.36%+2×0.32%+4%2×(42.32%+7.36%+0.32%)+(46%+4%)=8%,则B的频率=1-b的频率=1-8%=92%.故选:D.

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