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None of Snowflake's offspring were albino, but all should be heterozygous, recessive carriers, for the albino gene. [15] Half of his grandchildren likely carry the albino gene. If both parents were albino gene carriers, they have a 25% chance of producing an albino offspring and a 50% chance that the offspring will be a carrier of the gene. [16]
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Down syndrome or Down's syndrome, [12] also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [3] It is usually associated with developmental delays, mild to moderate intellectual disability , and characteristic physical features.
A white tiger at the Madrid Zoo. The white Bengal tigers are distinctive due to the color of their fur. The white fur is caused by a lack of the pigment pheomelanin, which is found in Bengal tigers with orange color fur.
Albinism is a rare genetic condition that causes a lack of pigmentation in the skin, hair and eyes. Because the gene itself is so rare, albino dogs are also incredibly rare.
However, this is not always the case and many albino animals do not have pink pupils. [9] The common belief that all albinos have pink pupils results in many albinos being incorrectly labeled as 'leucistic'. The neural crest disorders that cause leucism do not result in pink pupils and therefore most leucistic animals have normally colored eyes.
Familiar albino animals include in-bred strains of laboratory animals (rats, mice and rabbits), but populations of naturally occurring albino animals exist in the wild, e.g., Mexican cave tetra. Albinism is a well-recognized phenomenon in molluscs, both in the shell and in the soft parts.