I think what you are getting at is that life is all very similar. Most species have very similar genes. Why you can study genes in flies and yeast and worms a

I think what you are getting at is that life is all very similar. Most species have very similar genes. Why you can study genes in flies and yeast and worms and have it be relevant to human genetics. In very simplified biology genes just make proteins. There is a fair amount of software to find these similar genes across various species called “orthologs” https://en.m.wikipedia.org/wiki/Sequence_homology#Orthology https://en.m.wikipedia.org/wiki/Sequence_homology#Orthology I’ve run some of these tools. They can be a little rough, but generally they work. You are right though, it’s totally amazing it works. Amazing being alive.