早在科学家开始利用基因科学之前，我们的祖先已经实行了选择性育种。对于我们来说，人工选择并不是一个不可知的术语。这是人类从物种中人为选择好的基因，并将它们传递给下游的一种方法，这样一些有益的特性就可以继续下一代。根据“枪械与钢铁”（1997）的说法，人们已经成功驯养了14只大型动物。而且，如前所述，人工选择不仅适用于家养动物，还可用于驯化作物，改良品种。农民在某个特定时期种植农作物，从收获的农作物中选出最强壮，最大的种子，然后选择其中一些作物种植明年的作物。鉴于上述事实，我们可以感受到遗传修饰的力量。随着人类进入21世纪，人们的生活水平也有了很大提高。人们不仅满足于自我喂养，而且开始考虑如何活得更久，生活得更好。这可能会触发科学家进一步发现人体的秘密。科学家们开始研究基因后，对基因有了更加清晰的认识：构建基因蓝图 – 人类基因组。当科学家能够弄清楚每个基因的功能时，科学家就开始考虑操纵我们的基因。 “2009年2月，洛杉矶的一家生育诊所试图提供头发和眼睛颜色的选择，但在面对公众反弹的情况下收回了产品”（设计师孩子们如何工作，2001年）。因此可以看出，不管我们不知道将来究竟会发生什么事情，基因的操作，但它贯穿我们的眼睛。
Long before scientists start exploiting the Genetic science, our ancestors have already practiced the selective breeding. For us, Artificial selection is not an unacquainted term. It is a way for humans to choose good genes artificially from species, and pass them down to off springs, so that some beneficial traits could continue with the next generation. According to Guns Germs and Steel (1997), people have successfully domesticate fourteen large animals. And the artificial selection are not only used to domestic animals, as I mentioned before, it is also used to domesticate crops and bring improved varieties. Farmers plant crops at some particular period, and choose the strongest, largest seeds from the crops they harvested, and then select some of those plants for breeding next year’s crops. In view of the above mentioned facts, we could feel the power of Genetic modification. As humans move further into 21st Century, the living standards of people have improved a lot. People are not only be satisfied with feeding themselves，they start considering how to live longer, and live well. That probably triggers scientists to further discover the secrets of human bodies. A more clear understanding to genes came up after the scientists started to work on the: building up the genetic blueprint — human genome. It is the point that scientists start thinking about manipulating our genes when scientists were able to figure out what each gene does. “In February 2009, a fertility clinic in Los Angeles tried to offer selection of hair and eye color but retracted the offering in the face of public backlash” ( How designer children work, 2001). Thus it can be seen that, no matter we do not know what will really happen in future about Gene manipulation, but it does walk through into our eyes.