科学家已识别出负责这种遗传特征的基因。

Scientists have identified the ___gene responsible for this inherited trait.

研究聚焦于与长寿相关的人类基因。

Research is focused on human ___genes associated with longevity.

这个由父母遗传下来的特定基因，决定了个体对某些病症的易感性。

This particular ___gene, passed down from parents, determines an individual's susceptibility to certain conditions.