The X and Y have many functions, and you wouldn't assume that a single chromosome controls a single trait.

X 和 Y 有很多功能，您不会假设单个染色体控制单个特征。

That one survivor, that one in 3,000, may just possess the single trait giving it the ability to make a quick escape as its siblings are eaten.

那个幸运儿，三千分之一可能含有单一性状使兄弟姐妹们被吃掉的时候自己能够快速逃脱。