The black and orange patches that define the coloring of a calico cat beautifully illustrate the genetic mechanism known as "dosage compensation" through X chromosome inactivation. Shutterstock Image ...
Frieda, a tortoiseshell cat, sits on at cat scratching pad shaped like a chaise lounge. She is one of the foster cats up for adoption at the LapCats cattery in Sacramento, Wednesday, Dec. 22, 2015.
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