artificial selection 是什么意思

	【生物学】人为淘汰。

	artificial: adj. 1.人工的，人造的；人为的 (opp. nat ...
	selection: n. 1.选择；挑选；选拔。 2.拔萃；选择物；精选物[ ...

	1.	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

artificial selection是什么意思