英语语法分析

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 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；

However there is one species of pond snail, Lymnaea stagnalis, which demonstrates examples of both clockwise or anticlockwise spiralling shells.

然而，有一种叫做“静水椎实螺”的田螺，它是同时拥有顺时针和逆时针螺壳的典型代表。