穿过地理梯度，莱文斯预料有分布区不重叠的小种或近群种。
Across geographic gradients, Levins expects allopatric RACES or coenospecies exist.
结果中国人群HLA - A位点的第一主成分自北向南形成了明显的遗传地理梯度变异。
Results the first principle component of the HLA -a loci in the Chinese population has obvious geographic genetic structure from north to south.
人们认为这种梯度变异可能是降水量，温度也许还有光周期等地理趋势造成的结果。
The cline is considered the probable result of geographic trends in precipitation, temperature, and perhaps also photoperiod.
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