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【单选题】
1,科罗拉多大峡谷中的松鼠(原种群中黑基因A的基因频率为50%)被一条河流分隔成两个种群,两个种群现在已经发生明显的分化。研究人 员指出,经过长期演化可能形成两个物种,下列说法错误的是
A.
物种的形成必须通过 a 最终达到 c
B.
①②③④⑤⑥ 为生物进化提供原材料
C.
b 的变化是生物进化的实质
D.
若环境变化后，种群中基因型为 AA 、 Aa 的个体数量在一年后各增加 20% ，基因型为 aa 的个体数量减少 20% ，则一年后 a 的基因频率为 5/11
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