What is polydactyly an example of?
What is polydactyly an example of?
Polydactyly, also known as hyperdactyly or hexadactyly is the most common hereditary limb anomaly characterized by extra fingers or toes, with various associated morphologic phenotypes as part of a syndrome (syndromic polydactyly) or may occur as a separate event (non-syndromic polydactyly).
What type of inheritance is polydactyly?
Polydactyly is an abnormality characterized by extra fingers or toes. The condition may be present as part of a collection of abnormalities, or it may exist by itself. When polydactyly exhibits by itself, it is inherited as an autosomal dominant trait.
What do you call someone with polydactyly?
The extra fingers or toes are described as “supernumerary,” which means “more than the normal number.” For this reason, the condition is sometimes called supernumerary digit. A range of treatments is available depending on the type of polydactyly, and the cause is often genetic.
What is the most common form of polydactyly?
Postaxial polydactyly occurs on the outside of the hand or foot, where the fifth digit is. In the hand, this is called the ulnar side. This is the most common type of polydactyly. Preaxial polydactyly occurs on the inside of the hand or foot, where the thumb or big toe is.
Why is polydactyly not common?
Well, those versions of genes are rare. You don’t meet many people with extra fingers or toes. This means when two people meet and have a baby, odds are neither has the “six-finger” copy of a gene. Since they both have the “five-finger” version, the baby will too.
What is the sixth finger called?
| Polydactyly | |
|---|---|
| Other names | Hyperdactyly |
| A left hand with postaxial polydactyly | |
| Specialty | Medical genetics |
Is polydactyly homozygous or heterozygous?
It is caused by a dominant allele of a gene. This means it can be passed on by just one allele from one parent if they have the disorder. Someone who is homozygous (PP) or heterozygous (Pp) for the dominant allele will develop Polydactyly.
Is polydactyly an atavism?
But in his studies of atavistic guinea pig “polydactyly” Wright also made another striking discovery, namely polydactyly which was not atavistic but syndromal, not polygenic with threshold but a “simple” dominant.
What is the opposite of polydactyly?
Oligodactyly: Having fewer than the normal number of fingers or toes. Oligodactyly is the opposite of polydactyly.
What chromosome is affected by polydactyly?
Phenotype-Gene Relationships
| Location | Phenotype | Gene/Locus |
|---|---|---|
| 7p14.1 | Polydactyly, postaxial, types A1 and B | GLI3 |
