The nomenclature that will be used in this article is the standard nomenclature that is used in all genetics. In this article we will call the gene for crop ear ' C ' and the small letter ' c ' will be the gene for normal ears. All animals will have two genes for crop ear, one derived from their dam and one derived from their sire. This is the same as all autosomal genes. This is the case with all dominant genes.
Crop ear is dominant over normal ears.
All of their calves should have some degree of crop ear. Cc these animals should also have crop ear but these are the ones that account for the variation in severity. All animals in Australia should be like this. An interesting way to look at it is with all the possible matings involving these genes. I am not saying that an animal with a crop ear gene will always have visible crop ear though.