sexual dimorphism

(redirected from Sexual dimorphisms)
Also found in: Dictionary, Encyclopedia.

dimorphism

 [di-mor´fizm]
the quality of existing in two distinct forms. adj., adj dimor´phic, dimor´phous.
sexual dimorphism physical or behavioral differences associated with sex.
having some properties of both sexes, as in the early embryo and in some hermaphrodites.

sex·u·al di·mor·phism

the somatic differences within species between male and female individuals that arise as a consequence of sexual maturation; inclusive of, but not restricted to, the secondary sexual characteristics.
A physical dichotomy between males and females of a particular species

sex·u·al di·morph·ism

(sek'shū-ăl dī-mōr'fizm)
The somatic differences within species between male and female individuals that arise as a consequence of sexual maturation, including, but not restricted to, the secondary sexual characters.

sexual dimorphism

the presence in a population of two sexes each with a different PHENOTYPE, a classic example of a GENETIC POLYMORPHISM. The underlying mechanism varies in different organisms, but is often controlled by genes on special SEX CHROMOSOMES (see SEX DETERMINATION).

sex·u·al di·morph·ism

(sek'shū-ăl dī-mōr'fizm)
Somatic differences within species between male and female individuals that arise as a consequence of sexual maturation.

dimorphism

the quality of existing in two distinct forms.

sexual dimorphism
1. physical or behavioral differences associated with sex; males and females of the same species are different in appearance.
2. having some properties of both sexes, as in the early embryo and in some hermaphrodites.

sexual

pertaining to sex.

sexual behavior
includes masturbation, courtship, mating, estral display.
sexual cycle
estral cycle.
sexual differentiation
identification of the sex of a patient is done usually by an examination of external genitalia; preparation and examination of a karyotype is the preferred laboratory method.
sexual dimorphism
differences in structure or physical characteristics between males and females of the same species, e.g. horns in some breeds of sheep, feather coat color in many species of birds.
sexual intercourse
see mating.
sexual maturity
capable of mating. Occurs at different ages in different species and in different races and even breeds.
sexual receptivity
behavioral changes in female animals at the time of estrus; involves acceptance of male efforts at copulation and, in some species, actively seeking the male.
sexual rest
circumstances in which no sexual intercourse takes place.
References in periodicals archive ?
Unlike Singh's data, however, the figurines examined here do not display a clear bimodal distribution related to sexual dimorphism.
193) Likewise, evolutionary biology makes clear that sexual dimorphisms in coloration and ornament come about mainly through sexual selection, and that such features play an enormous role in animal behavior and social systems.
213) An examination of the evolutionary pressures that result in sexual dimorphisms in animals suggests some reasons why this anomaly might exist and also helps answer the question what the legal standard should look like for eliminating barriers to equal employment opportunity for women.
SEXUAL SELECTION AND SEXUAL DIMORPHISM IN HUMAN AND NONHUMAN ANIMALS: THE PEACOCK'S TAIL AND OTHER FANCY ACCOUTREMENTS A.
Here, the evidence for sexual dimorphism in male foreleg morphology within wolf spiders (family Lycosidae) is reviewed and shown to occur in a number of species belonging to at least seven genera in five subfamilies: Alopecosa, Hogna, Schizocosa (all Lycosinae) Pirata (Piratinae), Evippa, (Evippinae), Pardosa (Pardosinae) and Artoria (Artoriinae).
Keywords: Courtship display, sexual dimorphism, sexual selection, secondary sexual traits
This preoptic brain region is larger in female than in male rats, and this sexual dimorphism develops in response to perinatal exposure to sex steroid hormones mediated at least in part by the ER-[beta] (Orikasa et al.
This latter result is not surprising given that any sexual dimorphism in the volume of the SON is entirely attributable to body size, such that the larger SON of male rats is proportional to the larger body size of males, and the smaller SON and body size of females are similarly proportional (Madeira et al.
We would also predict that, because of stabilizing selection exerted by the need for pollinator recognition, floral sexual dimorphism should be less marked in these insect-pollinated plants, compared to wind-pollinated plants that share their derivation via monoecy.
Pollinators, as mentioned above, would restrain the degree of floral sexual dimorphism through stabilizing selection on the extreme of flower forms.
Further, it could be argued that Lake Apopka, Moonshine Bay, and WCA 3A are all intermediate between Lake Woodruff and Belle Glade (essentially best and worst case scenarios) because none of these sites exhibited sexual dimorphisms.
Sulfotransferase activity demonstrated no sexual dimorphism at any of the sites investigated, although elevated activity was observed in males from the Lake Okeechobee watershed compared to those from Lake Woodruff.