The genetic structure has changed due to artificial selection and genetic differentiation index indicated slight differentiation among them 由于人工定向选择，它们的遗传结构已经起了一定的变化，分化系数表明它们之间已经产生了分化。
2.
Almost every morsel of our food is genetically modified - admittedly by artificial selection not artificial mutation , but the end result is the same 我们吃的几乎每一口食物都是转基因的? ?通过人工选择而不是人工突变，但是最终结果是相似的。
3.
A group of organisms having common ancestors and certain distinguishable characteristics , especially a group within a species developed by artificial selection and maintained by controlled propagation 属一群拥有共同祖先和明显特征的有机体，尤指属于同一物种的一群，通过人工选择来发展，通过有控制的繁殖来维持
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