Human Evolution and Frameshift Mutations

“It’s where a single letter in our tape disappears, or a new random one gets thrown in, causing our frame to get shifted slightly. This means that the resulting triplets after this error will be horribly wrong. It’s like the difference between

HEY MAN HOW ARE YOU BRO and
HEY MAN HWA REY OUB RO_ or
HEY MAN HOQ WAR EYO UBR O__”