两极分布是海洋生物中的一种隔离分布现象，即一个种或类群同时分布在南北两半球海洋的某一区域，而不分布在中间的热带海洋。
染色体在两极分布不均衡；
The distribution of chromosomes was unequal, and some univalents divided.
在地球，原子内粒子在地球磁场的作用下呈流状分布在两极。
As on Earth, the particles are channelled to the poles by the planet's magnetic field.
海龟主要出现在大西洋，太平洋和印度洋的热带水域，但是有些种类在这些水域的分布范围可接近南北两极。
The marine species occur predominantly in tropical waters of the Atlantic, Pacific, and Indian oceans, but several also range far poleward in these waters.
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