Exception to the Rule

Calicos have patches of white, orange and brown or black fur. That means every calico must carry two X chromosomes. Therefore, to make a male calico, he needs to carry three chromosomes: XXY.
Calicos have patches of white, orange and brown or black fur. That means every calico must carry two X chromosomes. Therefore, to make a male calico, he needs to carry three chromosomes: XXY.