For the past 9,000 years, American black bears have slowly been turning red due to a genetic variant.
Some American black bears in the western United States have evolved to have cinnamon-colored fur. The new hue is likely due to a genetic variant similar to one that causes albinism in humans, a new study finds.
"TYRP1 is a known pigmentation gene in the pathway in the precursor molecules that ultimately produces either eumelanin or pheomelanin ," Emily Puckett , the study's lead author and an assistant professor in biological sciences at The University of Memphis in Tennessee told Live Science."What it's doing is changing the amino-acid sequence of that gene."
But even that is a slow process, with the majority of black bears on the East Coast still sporting jet-black fur.
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