Corn became so dissimilar to its ancestor , teosinte , that its origin was commonly disputed until very recently [ see illustration above ] 玉米和其祖先大刍草的外观大相迳庭，直到最近，有关它们的起源的争议才平息（见上图） 。
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Wild cotton for instance creeps past the florida keys across the gulf of mexico and into mexico . in south america a weedy corn relative teosinte dresses the edges of domesticated cornfields 举例来说，野生棉花已经蔓延过弗罗里达群岛，横越墨西哥湾进入墨西哥在南美洲的玉米田周围，长着它们的野生亲戚，蜀黍。
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In corn ' s wild relative , teosinte , these alleles occur in only 7 to 36 percent of plants , indicating that the selection pressure applied by early farmers to favor those alleles was rapid and thorough 而在玉米的野生亲戚大刍草里，这些对偶基因的出现率只有7 ~ 36 % ，显示出早期农民对偏好的对偶基因，施予的选择压力很彻底而且快速。
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