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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 (from Greek πολυ-poly-'many') is when a limb has more than the usual number of digits. This can be: As a result of congenital abnormality in a normally pentadactyl animal. Polydactyly is very common among domestic cats. For more information, see polydactyly.
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.
New mutations, (often somatic, spontaneous and sporadic), not inherited from either parent are called de novo mutations. [10] The consensus on whether certain prenatal spontaneous mutations and genetic disorders that occur as a result of meiotic and chromosome errors [ 11 ] or during cell division after conception , like cystic fibrosis and ...
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.
This benign tumor may not cause any medical problems; however, some hypothalamic hamartomas lead to seizures or hormone abnormalities. Other features of Pallister–Hall syndrome include a split opening of the airway called bifid epiglottis , laryngeal cleft , blockage of the anal opening ( imperforate anus ), and kidney abnormalities.
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