达尔文的天择说架构在一个前提之上，那就是单一基因上的小改变，有时可能会让生物更适应环境，因而对生物有益。
Darwinian natural selection rests on the premise that sometimes a small change in a single gene can prove beneficial if it allows organisms to fare better in their environment.
直到19世纪20年代《现代综合法》中，孟德尔重新发现的“遗传学”与达尔文的“物竞天择说”相遇，科学才发生了很大的进步，才理解了进化机制。
Not until Mendel's rediscovered "genetics" met Darwin's natural selection in the "modern synthesis" of the 1920s did science take a giant step toward understanding evolutionary mechanics.
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