White tiger cub playing with his mother in the grass
hite tiger
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white tiger, colour variant of the Bengal tiger (Pantheria tigris tigris), the Siberian tiger (P. tigris altaica), or a hybrid between the two subspecies that is characterized by white fur, dark brown or black stripes, and blue eyes. This rare colour mutation, called leucism, which also occurs in many other animals, appears in perhaps one in 10,000 tigers in the wild. The mutation results from the mating of two tigers that carry the recessive allele that produces white fur in their offspring. More specifically, it stems from the substitution of a single amino acid in a single transporter protein that greatly reduces the production of one of the major types of the pigment melanin, called pheomelanin, which produces the reds, oranges, and yellows that appear in a tiger’s fur. White tigers do, however, possess eumelanin, the pigment that colours the tiger’s eyes and the hairs of its stripes. Leucism differs from albinism in that the latter is caused by a complete absence of melanin.
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