In experiments, an injection of cytoplasm from dextral eggs changes the pattern of sinistral eggs, but an injection&nbs p;from sinistral eggs does not influence dextral eggs.

• 可是，一些窝中会有一些相反旋向的蜗牛，而且在主要是左旋的窝种，出现右旋的几率是令人惊奇的高。