Joe has a white cat named Sam. When Joe crosses Sam with a black cat, he obtains 12 white kittens and 12 black kittens. When the black kittens are interbred, all the kittens that they produce are...

Joe has a white cat named Sam. When Joe crosses Sam with a black cat, he obtains 12 white kittens and 12 black kittens. When the black kittens are interbred, all the kittens that they produce are black. On the basis of these results, would you conclude that white or black coat color in cats is a recessive trait? Explain your reasoning.