directional · Relating to epistasis, where the effect of one gene is dependent on the presence of one or more 'modifier genes'.

这种性状表现与上位效应密切相关。

verb · To be promoted to a more senior role or to ascend to a position of power.

她凭借出色的业绩成功上位。

directional · A seat of honor or a person holding a high-ranking position.

他在晚宴上被安排在上位。