The timing of the evolutionary origins of the following 5 human traits ranges very widely. Put in order from most recent (1) to most ancient (5). lower back issues associated with bipedality our tails become reduced to just the coccyx, usually not visible without dissection the opsins in our eyes become three, giving us color vision the bones of the inner ear become three, the malleus, incus and stapes genes evolve that in us guide the differentiation of the forebrain, midbrain al hindbrain .