摘要：在豚鼠中.黑色对白色为显性.若某种群基因库中显性基因B的频率为90%.隐性基因b的频率为10%.则种群中基因型BB.Bb.bb的频率分别是 ( ) A.81%.18%.1% B.45%.40%.15% C.18%.81%.1% D.45%.45%.10% 答案 A

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