We can still easily recognize the GULO gene in the human genome. It’s there, and the vast majority of the code is the same as in other animals, but there are a few key parts that have been mutated. It’s as if you removed the spark plug from a car. It’s still a car. You can easily see that it is still a car. In fact, you would have to look very carefully to find anything wrong with it at all. But it cannot function as a car, not even slightly.
Nice but slightly inaccurate description of a pseudogene.
