That won't work because people breed dogs for a purpose, that's why we have breeds. We don't breed to have better hunting humans for example. We practice eugenics on dogs, but we don't practice it at scale on ourselves.
Cats are interesting, tabby cats are most like humans, because they are very "mixed" but not with a purpose, just at random and by convenience. Orange cats have specific behavioral traits, but they weren't bred on purpose either.
The "on purpose" part is important because in those cases, we keep breeding them until specific traits are exaggerated to the max. With human reproduction, if having a blonde hair is considered ideal in a specific part of a country over several hundred years, then yeah, you'll see blondes mate more than non-blondes and you'll have lots of blondes, but you'll still see blondes marry non-blondes so their great-grandchildren could have red or black hair just the same. Now instead of hair consider behavioral traits. Those are even more complicated because us humans don't operate on a purely instinctual directive like animals. if a person has a genetic propensity for violence for example, that doesn't mean much because they can still decide to act against their "genetics" (otherwise, it doesn't make sense to punish them). Even dogs bred for their violent nature can be trained out of it to a large extent.
Cats are interesting, tabby cats are most like humans, because they are very "mixed" but not with a purpose, just at random and by convenience. Orange cats have specific behavioral traits, but they weren't bred on purpose either.
The "on purpose" part is important because in those cases, we keep breeding them until specific traits are exaggerated to the max. With human reproduction, if having a blonde hair is considered ideal in a specific part of a country over several hundred years, then yeah, you'll see blondes mate more than non-blondes and you'll have lots of blondes, but you'll still see blondes marry non-blondes so their great-grandchildren could have red or black hair just the same. Now instead of hair consider behavioral traits. Those are even more complicated because us humans don't operate on a purely instinctual directive like animals. if a person has a genetic propensity for violence for example, that doesn't mean much because they can still decide to act against their "genetics" (otherwise, it doesn't make sense to punish them). Even dogs bred for their violent nature can be trained out of it to a large extent.