differing types of mutations (represented by otherwise colored arrows) happen at unique frequencies (represented by arrow thickness). choice functions like a sieve and enables only a subset of such mutations to persist https://anitanylr144636.blogripley.com/30358803/top-44-of-the-world-s-population-has-at-least-the-first-of-5-gene-mutations-and-every-gene-mutation-works-against-you-secrets