Calico-shell cats are always male because this characteristic is on the X chromosome and males have only one X chromosome.

Name: Calico-shell cats are always male because this characteristic is on the X chromosome and males have only one X chromosome.
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Calico cats are almost always female because the calico coloration is linked to the X chromosome, and females have two X chromosomes, allowing for the expression of both color genes. Males, having only one X chromosome, rarely exhibit this trait.

Calico-Shell Cats Are Always Male Because This Characteristic Is on the X