I was trying to explain that genes do some funky things sometimes. I'm not saying that cows and humans are equal I was simply giving an example.
Here's my question to you though, if evolution was working how come there are so many different animals and fish? Evolution is based on the fact that things adapt to their environment but how does it explain why we have cats, dogs, cows, snakes, humans, spiders, birds... how does it explin why there are mammals, fish, reptiles... why do chickens lay eggs, kangaroos have pouches and women have a uterus? Seems like a pretty complex system to come from the same single cell doesn't it.