Jul 14, 2019 · Hitchhiker's thumb is a recessive trait, which means that people must inherit the gene from both parents for it to manifest. People can also carry the gene without exhibiting the trait, by inheriting the gene from one parent only. Jun 18, 2019 · Hitchhiker’s thumb is a thumb that’s double-jointed and able to bend backward. Known formally as distal hyperextensibility, this condition isn’t painful and doesn’t inhibit the thumb’s function in any way. Your thumb’s bendability is controlled by its distal interphalangeal joint, the bendy point at which the bones of your thumb are connected.Author: Corey Whelan.
May 22, 2012 · Hitchhiker's thumb is a layman's term for distal hyperextensibility of the thumb.The joint closest to the end of the thumb is called the distal joint. In most people, the distal joint of the thumb allows the thumb to straighten and to bend forward (toward the palm of the hand).Reviews: 41. Jul 18, 2017 · Hitchhiker's thumb is otherwise known as distal hyperextensibility of the thumb. This is because of the genetic traits that make a person bend his thumb backward while stretching.4.5/5(21).
Hitchhiker's thumb: The myth. The myth is that there are just two kinds of thumbs, straight thumbs (S) and hitchhiker's thumbs (H), and the trait is controlled by a single gene with two alleles, with the allele for S being dominant. This was proposed by Glass and Kistler (1953) and has been the subject of very little research since then.