[EinNYC]

If they have Kitty Klinefelter's Syndrome (XXY), that is likely true.

In Calboy's case (that big male Maine Coon), he is a chimera, not a Klinefelters case. And he is most definitely a FERTILE boy, having sired several gorgeous litters so far.

[Dr. Sivana]

As a Chimera, does that make him XX/XY instead of XXY?