This is a good page, but one thing it doesn't touch on (presumably because of the intended audience) is the fact that an understanding of genetics is necessary

This is a good page, but one thing it doesn't touch on (presumably because of the intended audience) is the fact that an understanding of genetics is necessary but insufficient to explain speciation, variation in heritable traits, much of modern biology. Epigenetics is tremendously important, and a reductivist use of genetics via metaphor is what gets people talking about a "gene for X". It ends up, IMO, causing more harm than good.