its basically what you learned in basic high school biology, the black is dominant and the pink is recessive, if you have a 100% pure black and a 100% pure pink than all of the fry will be black. breed those fry and you'll get 50/50. and so on.
as wildcaught said calico cons come from generation upon generation of line breeding and takes time. yours most likely will wind up with a percentage of black and a percentage of pink because most cons these days arent very pure.