本帖最后由 miuumiu 于 4-11-2018 01:36 AM 编辑
 你读了吗？
1）
That said, outbreeding can also have deleterious effects. In general, it makes us less fit to a specific environment. Consider skin color. Africans have dark skin because it protects against sunburn and skin cancer. Northern Europeans evolved light skin because heavy clothing meant that without it, they didn’t synthesize enough Vitamin D and got rickets. So you can see that in each case, the skin color was appropriate to a specific environment and way of life. Now picture a mixed-race person like President Obama in either of those circumstances. In traditional life in Africa, he will have inadequate resistance to sunburn, and in Northern Europe, he won’t make enough Vitamin D. So really, it isn’t as simple as saying that one or the other has superior genetics. It might be more accurate to say that people of mixed race have less specialized genetics, and are less susceptible to the deleterious effects of genes that can cause conditions like sickle cell anemia when we inherit two of them, but may not have some advantages that are specific to a place — remember that in a country where malaria is common, having a single sickle-cell gene is a survival *advantage*.
当然quora是好像 中国的知乎的类型的网络提问的平台，如果你要专业的明天给你。
如果要说混血是为了改变基因变得更好，那为何我们105平均智商的要去个100平均智商的去混？和85的去混？如果为了外表那更加可笑，因为外形的喜好是跟时代转变而不具有优秀性的，唐朝还喜欢肥的，难道我们基因改变的太多所以和唐朝的人对外表喜好有着那么巨大的分布？？如果说为了体质那不如全部去混黑人？？？（当然现在有研究显示华人的基因拥有更多的建肌优势）.
所以最后我还是认为，混血除了个人喜好外，自卑也是某些人提倡去混血的根本。
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发表于 3-11-2018 08:38 PM
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