Crested duck, mallard

Getting quite tame this crested duck,  The   Crested Duck is a breed descended from the mallard . It has its appearance because it is heterozygous  for a genetic mutation  causing a deformity of the skull. As a result, when a pair of crested ducks breed, the young sort out in the usual 1-2-1 ratio:-does this mean the duck is quackers:-