For example: Can a soul be 28% black, 25% asian and 47% white?

I have some doubts related to reincarnation 1- Can an aryan person be reincarnated as a black person or vice versa? 2- Can an aryan or black person be reincarnated as a jew? 3- Can a jew be reincarnated as a ''normal'' person, like a black or aryan? or is there any ''law'' or condition that...