dichromatism


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dichromatism

 [di-kro´mah-tizm]
1. the quality of existing in or exhibiting two different colors.

di·chro·ma·tism

(dī-krō'mă-tizm),
1. The state of being dichromatic (1).
2. The abnormality of color vision in which only two of the three retinal cone pigments are present, as in protanopia, deuteranopia, and tritanopia. Synonym(s): dichromatopsia
[G. di-, two, + chrōma, color]

dichromatism

(dī-krō′mə-tĭz′əm) also

dichromism

(-mĭz′əm)
n.
1. The quality or condition of having or exhibiting two colors.
2. A form of colorblindness in which only two of the three fundamental colors can be distinguished due to a lack of one of the cone pigments.

di′cro·mat′ic (-măt′ĭk) adj.

di·chro·ma·tism

(dī-krō'mă-tizm)
1. The state of being dichromatic (1).
2. The abnormality of color vision in which only two of the three retinal cone pigments are present, as in protanopia, deuteranopia, and tritanopia.
Synonym(s): dichromatopsia.
[G. di-, two, + chrōma, color]

dichromatism

Partial color blindness in which only two of the primary colours can be perceived.

dichromatism

A form of colour vision deficiency in which all colours can be matched by a mixture of only two primary colours. The spectrum appears as consisting of two colours separated by an achromatic area (the neutral point). There are several types of dichromatism: deuteranopia, protanopia and tritanopia. Syn. daltonism; dichromatopsia; dichromatic vision. See defective colour vision; visual pigment.
References in periodicals archive ?
Hence, the comparative results were not confounded by consistent differences in sexual dichromatism, mating system, or body size.
Sexual dichromatism in the yellow-breasted chat lcteria virens: spectrophotometric analysis and biochemical basis.
Recent trends in studying avian signaling systems have focused on individual variability in plumage ratherthan dichromatism: sexual selection whereby females select preferred males from among a variety of types has been a popular line of investigation as has the study of status signaling where variation in appearance is interpreted as a signal of relative dominance status among groups of birds.
A few studies have examined sexual dichromatism in birds within the context of a phylogeny.
Such a well-defined and striking ephemeral sexual dichromatism has not been previously reported in Apogonidae.
Conserved distal promoter of the agouti signaling protein (ASIP) gene controls sexual dichromatism in chickens.
Melanin coloration in New World orioles I: carotenoid masking and pigment dichromatism in the orchard oriole complex.
giantism and dwarfism, elongated and shortened bills, feathered tarsi, supernumerary tail feathers, hypertrophied nose and eye ceres, frontal and occipital crests, colors of irises and orbital rings, sexual dichromatism as well as various plumage patterns.
Sexual dichromatism (Medveditsyna, 1962; Rutenberg, 1962) and behavioral changes in males (Nichol and Somerton, 2002; Lauth et al., in press) are primary indications of nesting activity.
Some species exhibit permanent sexual dichromatism, where different color patterns are adopted for each sex and retained for life (DeMartini 1985; Kodric-Brown 1998).