n. cline
misc. character gradient
这样一个变异区域称为梯度变异。
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.
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.
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