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Polydactyly occurs in numerous types of animals. The condition is sporadically seen in livestock, where it affects cattle, sheep, pigs, and occasionally horses. [ 75 ] Conversely, it is a common trait in several heritage chicken breeds .
Polydactyly There are probably many genes, both dominant and recessive, that cause polydactyly in cats. Most cases of polydactyly in cats are perfectly harmless. Pd Thumb-cat polydactyly gene. The Pd gene (dominant with incomplete penetrance) causes the benign, pre-axial form of polydactyly where one or more extra toes occur near the dew claw.
One of the polydactyl cats at the Ernest Hemingway House in Key West, Florida.This particular cat has seven (two extra) toes on each paw. A polydactyl cat is a cat with a congenital physical anomaly called polydactyly (also known as polydactylism or hyperdactyly), which causes the cat to be born with more than the usual number of toes on one or more of its paws.
All of the cats in the litter were born with polydactyly, a relatively common and harmless genetic variation in cats which means they are born with multiple extra toes. Related: 22-Pound ...
Polydactyly in Maine Coon cats is characterised by broad phenotypic diversity. [31] Polydactyly not only affects digit number and conformation, but also carpus and tarsus conformation. [ 32 ] The trait was almost eradicated from the breed due to the fact that it was an automatic disqualifier in show rings. [ 33 ]
Inheritance of abnormal genes, e.g. polydactyly, ectrodactyly or brachydactyly, symptoms of deformed limbs then often occur in combination with other symptoms ; external causes during pregnancy (thus not inherited), e.g. via amniotic band syndrome; teratogenic drugs (e.g. thalidomide, which causes phocomelia) or environmental chemicals
The polydactyly in these largely aquatic animals is not to be confused with polydactyly in the medical sense, i.e. it was not an anomaly in the sense it was not a congenital condition of having more than the typical number of digits for a given taxon. [1] Rather, it appears to be a result of the early evolution from a limb with a fin rather ...
A well-known example is polydactyly in Hemingway’s cats, which is the presence of extra toes. The number of extra toes can differ between cats, due to variable expressivity of the ZRS gene in the feline chromosome A2.