| quantitative trait | A characteristic showing quantitative inheritance such as skin pigmentation in man. (12 Dec 1998) |
|---|---|
| heritable | Capable of being transmitted from parent to child. (12 Dec 1998) |
| quantitative | Denoting or expressible as quantity, relating to the proportionate quantities or to the amount of the constituents of a compound. Origin: L. Quantitativus (18 Nov 1997) |
| quantitative alteration | In electric irritability, a gradual loss of contractility in a muscle in response to static, faradic, and galvanic currents successively. (05 Mar 2000) |
| quantitative analysis | Determination of the amount, as well as the nature, of each of the elements composing a substance. (05 Mar 2000) |
| quantitative genetics | The formal study of measurable genetic traits, traditionally but not necessarily confined to galtonian genetics. (05 Mar 2000) |
| quantitative hypertrophy | <pathology> The abnormal multiplication or increase in the number of normal cells in normal arrangement in a tissue. Compare: hypertrophy. Origin: Gr. Plasis = formation (18 Nov 1997) |
| quantitative perimetry | A plotting of the visual field in isopters of equal retinal sensitivity. (05 Mar 2000) |
| Bombay trait | A rare recessive trait at a locus that ordinarily manufactures H substance, the precursor from which the A and B phenotypes are elaborated; the mutant causes failure to produce H substance and no matter what the genotype at the ABO locus, the phenotype is O. The Bombay phenomenon is epistatic to the ABO locus. Origin: Bombay, India, where first reported (05 Mar 2000) |
| galtonian trait | A quantitative genetic trait due to contributions from many more of less equally important loci that resembles a continuous trait. (05 Mar 2000) |
| recessive trait | See: dominance of traits. (05 Mar 2000) |
| marker trait | A trait that may be of little importance in itself but which by association, linkage, or other means facilitates the detection, anticipation, or understanding of a disease or (for genetic diseases) the localization of the causative gene on the karyotype. (05 Mar 2000) |
| categorical trait | <genetics> A feature that can conveniently and effectively be analyzed by sorting into classes either because there is no satisfactory way of measuring it (as with blood groups) or because it falls into natural classes so that the variation among classes far exceeds that within classes (e.g., the phenotypic effects of many enzyme polymorphisms); existence of categories suggests but does not prove the operation of a major, simple, underlying cause. Synonym: qualitative trait. (05 Mar 2000) |
| penetrant trait | A trait that in the appropriate genotypes is phenotypically manifest; strictly, it is the trait that is penetrant, not the gene. See: penetrance. (05 Mar 2000) |
| mendelian trait | A categorical trait that segregates in accordance with a single-locus genetic system. (05 Mar 2000) |