现在很清楚,杂种形成的种子具有两个分化性状中的一个或另一个,其中一半再次发育成杂种形式,而另一半产生保持恒定并以相等数量接收显性或隐性性状的植物。
The greatest education in the world is watching the masters at work.
The greatest risk is standing still while the world changes around us.
"The only thing we know about the future is that it will be different."