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(video) A white tiger in a zoo in Japan Pseudo-melanistic white tiger. A white tiger's pale coloration is due to the lack of the red and yellow pheomelanin pigments that normally produce the orange coloration. [2] This had long been attributed to a mutation in the gene for the tyrosinase (TYR) enzyme.
Leucistic white lions owe their colouring to a recessive allele. Note the eyes and lips remain the normal colour. Studies have shown that the reduced pigment comes from a mutation in the gene for tyrosinase, the same as causes Type I oculocutaneous albinism in humans. [1] This white horse owes its coloring to a dominant allele (dominant white).
In the 2013 study that identified the genetic cause of the white tiger phenotype, they determined that the tyrosinase gene was completely normal, and that the mutation was instead in a gene called SLC45A2.
Danaus melanippus, the black veined tiger, white tiger, common tiger, or eastern common tiger, is a butterfly species found in tropical Asia which belongs to the "crows and tigers", that is, the danaine group of the brush-footed butterflies family.
Vets at Marwell Zoo have carried out root canal work on a 27-stone (170kg) tiger.
Genetic studies of albinism in amphibians have focused on mutations in the tyrosinase gene. The albino phenotype of the leopard frog ( Rana pipiens ) has been attributed to a failure in post-translational control in a single recessive tyrosinase gene which still has some tyrosinase and DOPA oxidase activity.
A white snake with an 'incredibly rare' genetic mutation that left its skin a luminous pearly white color was recently discovered in Australia.
Normally, the white gene is expressed in every cell of the adult Drosophila eye resulting in a red-eye phenotype. In the w[m4] mutant, the eye color was variegated (red-white mosaic colored) where the white gene was expressed in some cells in the eyes and not in others. The mutation was described first by Hermann Muller in 1930. [4]