“X” is for X Chromosome in Tortoiseshell and Calico Cats

This is post #24 in the blogging A to Z Challenge.

My kitty Harmony has a beautiful dilute tortoiseshell coat. After adopting her in 2012, I learned that over 99% of tortoiseshell and calico cats are female. A cat’s coat color is determined in a large part by the sex chromosomes. Two X chromosomes are among the requirements to be a tri-color cat. This video does a great job of explaining. Enjoy!

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