Most spiral-shaped snail species are predominantly dextral.
大多数螺旋形的蜗牛主要是右旋的。
In the case of Lymnaea peregra, studies indicate that a dextral gene is expressed during egg formation.
在锥实螺的例子中,研究表明右旋基因是在卵的形成期表达的。
In experiments, an injection of cytoplasm from dextral eggs changes the pattern of sinistral eggs, but an injection from sinistral eggs does not influence dextral eggs.