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The extra digit in these breeds presents as an extra "thumb" that does not touch the ground. [76] Mixed-breed chickens may also have extra digits if the aforementioned breeds are part of their genetic makeup. [citation needed] Polydactyly also occurs in dogs, cats, and small mammals such as guinea pigs [78] and mice. [79]
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.
Humans normally have five digits on each extremity. Each digit is formed by several bones called phalanges, surrounded by soft tissue. Human fingers normally have a nail at the distal phalanx. The phenomenon of polydactyly occurs when extra digits are present; fewer digits than normal are also possible, for instance in ectrodactyly.
Although extra teeth may be a maladaptive trait in modern humans due to potential dental issues and crowding, whether individuals with supernumerary teeth have a benefit or disadvantage is unknown. In the context of human evolutionary history, dental care was virtually nonexistent, meaning that there was no way to address dental issues such as ...
Oligodactyly (from Greek ὀλιγο-oligo-'few') is having too few digits when not caused by an amputation. It is sometimes incorrectly called hypodactyly or confused with aphalangia, the absence of the phalanx bone on one or (commonly) more digits. When all the digits on a hand or foot are absent, it is referred to as adactyly. [4]
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Pallister–Hall syndrome (PHS) is a rare genetic disorder that affects various body systems. [1] The main features are a non-cancerous mass on the hypothalamus (hypothalamic hamartoma) and extra digits (polydactylism).
In the latest quarter, that growth slowed to the double digits -- but that's not surprising considering comparison quarters have become quite difficult. For example, in the third quarter of last ...