对以自然选择学说为核心的现代生物进化理论的正确解释是( ) ①环

对以自然选择学说为核心的现代生物进化理论的正确解释是(  )

①环境改变使生物产生适应性的变化

②隔离是新物种形成的必要条件

③生物进化的实质在于种群基因频率的改变

④生物进化的实质在于有利变异的保存

⑤突变和基因重组是不定向的

⑥自然选择使种群的基因频率定向改变并决定生物进化的方向

⑦自然选择是通过斗争实现的

⑧变异是定向的

A.①②⑦⑧        B.②③⑤⑥

C.③⑤⑥⑦    D.①④⑤⑦

 

答案

B

以自然选择学说为核心的现代生物进化理论认为:突变和基因重组为生物进化提供原材料,自然选择决定生物进化的方向,隔离导致新物种的形成。

 

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