有这样一个群体,基因型为AA的个体为2000,基因型为Aa的个体为2000,

有这样一个群体,基因型为AA的个体为2000,基因型为Aa的个体为2000,基因型为aa的个体为6000。他们迁移到一个孤岛上生存繁衍。A基因在初始时的频率和繁衍两代(假设子代都存活)后的频率分别是

A.0.2和0.3                    B.0.3和0.3               C.0.2和0.5               D.0.3和0.5

答案

B

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