
For more information on linkage, visit Britannica.com.
(genetics)
Failure of two or more genes to recombine at random as a result of their location on the same chromosome pair. Among the haploid products of a cell which has gone through meiosis, two genes located in the same chromosome pair remain in their two original combinations of alleles (“parental”) unless an odd number of exchanges of homologous segments occurred within the interval bounded by their loci. The incidence of exchanges of homologous segments at meiosis is roughly proportional to the length of the chromosome segment between two loci. The percentage of recombinants thus provides an estimate of this length and a basis for constructing gene maps on which linked loci are arranged in linear order and spaced out in proportion to the recombination percentages between them. See also Meiosis.
Linkage (mechanism)
A set of rigid bodies, called links, joined together at pivots by means of pins or equivalent devices. A body is considered to be rigid if, for practical purposes, the distances between points on the body do not change. Linkages are used to transmit power and information. They may be employed to make a point on the linkage follow a prescribed curve, regardless of the input motions to the linkage. They are also used to produce angular or linear displacement. See also Link; Mechanism.
If the links are bars the linkage is termed a bar linkage. A common form of bar linkage is one for which the bars are restricted to a given plane, such as a four-bar linkage. A commonly occurring variation of the four-bar linkage is the linkage used in reciprocating engines (see illustration). Slider C is the piston in a cylinder, link 3 is the connecting rod, and link 4 is the crank. (Link 1 is the fixed base, A and D are pivots, R is the length of the crank, L is the length of the connecting rod, and τ denotes the angle of the crank.) This mechanism transforms a linear into a circular motion, or vice versa. The straight slider in line with the crank center is equivalent to a pivot at the end of an infinitely long link. See also Four-bar linkage; Pantograph.

Slider crank mechanism.
A linkage between related information. Hypertext is the foundation of the World Wide Web, enabling users to click on a link to obtain more information on a subsequent page on the same site or from a Web site anywhere in the world. Hypertext is the umbrella term for all links, whether appearing as text (word, phrase or sentence) or as an icon or other graphical element, the latter technically called a "hypergraphic." The terms "hypertext," "hyperlink" and "link" are also used synonymously. See hypermedia, live link and virtual hypertext.
The term was coined by Ted Nelson in 1963. However, his vision was much more expansive than the one-way links of today's Web. Nelson proposed two-way linking and support for non-hierarchical organization (for more information, visit
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| Link, Linealfoot | |
| Liquid Asset, Liquidate |
noun
Linkage occurs when an investor is able to purchase a security on one financial exchange and sell it on another. Certain depositary receipts, such as American Depositary Receipts (ADRs), allow for linkage, which means that an investor can purchase shares of a company on a foreign exchange, such as the Toronto Stock Exchange, and then sell those shares on a domestic exchange, such as the New York Stock Exchange.
Investopedia Says:
Linkage should not be confused with arbitrage situations where an investor looks to profit from price discrepancies for equivalent securities trading on different exchanges. As financial markets progress, specifically with the growth of electronic exchanges spreading, the phenomenon of linkage will become more relevant and useful for investors in the future.
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| link, linewidth, linearly polarized | |
| linkage disequilibrium, linkage group, linkage map |
1. the connection between different atoms in a chemical compound, or the symbol representing it in structural formulae. See also bond.
2. in genetics, the association of genes having located on the same chromosome, which results in the tendency of a group of such nonallelic genes to be associated in inheritance (linkage disequilibrium). Called also syntenic group.
The connection between two or more objects. In computer programming, coding that connects two separately coded routines.

| Look up linkage in Wiktionary, the free dictionary. |
Linkage generally means "the manner or style of being united", and can refer to:
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