显性效应(dominance effect)等位基因间互相作用产生的效应，亦即基因型值(G)与其加性效应值(D)的差。又叫显性高差，以H表示，即H=G-D(设上位性效应I=0)。其值可为正数或负数，大小取决于群体中的基因频率，并是各位点内显性值的总和。
第二个模型只包括简单的加性和显性效应。
烤烟叶数性状主要受加性效应控制，腰叶长、腰叶宽和叶面积主要受显性效应控制。
Number of leaves was mainly controlled by additive effects, dominance effects were the major genetic component for length of leaves, width of leaves and area of leaves.
精研细读所有要素，弄清诗歌的主要张力，解释诗怎样通过解决这些张力而达到显性效应。
After carefully examining all elements, state the poem's chief overarching tension and explain how the poem achieves its dominant effect by resolving such tensions.
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