Yep, that is true! The gene for fur color is on the X chromosome and since females (XX) have both, they get a good mixture that you see in tortoiseshell cats. Males are XY so in a similar litter they would be a more uniform color. Male tortoiseshells do actually occur in the rare case that they have an extra chromosome (XXY), but unfortunately they usually don't live long after birth because of the genetic abnormality, so they are super rare. Good suggestion, I'll start posting her more often!
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