univalent

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Related to univalents: bivalent

u·ni·va·lent

 (yo͞o′nĭ-vā′lənt)
adj.
1. Chemistry
a. Having valence 1, regardless of whether the valence is positive or negative.
b. Having only one valence.
2. Genetics Of or relating to a chromosome that is not paired or united with its homologous chromosome during synapsis.
3. Immunology Having only one site of attachment. Used of an antibody or antigen.
4. Immunology Containing antigens from a single strain of a microorganism or virus. Used of a vaccine or serum.
n. Genetics
A univalent chromosome.

univalent

(ˌjuːnɪˈveɪlənt; juːˈnɪvələnt)
adj
1. (Genetics) (of a chromosome during meiosis) not paired with its homologue
2. (Chemistry) chem another word for monovalent
ˌuniˈvalency, ˌuniˈvalence n

u•ni•va•lent

(ˌyu nəˈveɪ lənt, yuˈnɪv ə-)

adj.
1. having a chemical valence of one; monovalent.
2. Biol.
a. having one binding site, as an antibody.
b. unpaired, as a chromosome.
[1865–70]

u·ni·va·lent

(yo͞o′nĭ-vā′lənt)
Chemistry
Having a valence of one.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.univalent - used of a chromosome that is not paired or united with its homologous chromosome during synapsis; "a univalent chromosome"
genetic science, genetics - the branch of biology that studies heredity and variation in organisms
bivalent, double - used of homologous chromosomes associated in pairs in synapsis
multivalent - used of the association of three or more homologous chromosomes during the first division of meiosis
2.univalent - having a valence of 1
chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
Translations

univalent

[ˈjuːnɪˈveɪlənt] ADJunivalente

univalent

adjeinwertig
References in periodicals archive ?
With respect to the types of the induced aberrations, it was observed that dissociated univalents dominated (autosomal and X-Y univalents).
In contrast, tetraploid plants show quite irregular meiosis, with frequent formation of univalents and quadrivalents, and apomixis as the reproductive mode.
In diakinesis, the chromosomes were predominantly associated as bivalents, but univalents and tetravalent were also observed in a lower frequency (Figure 1A).
The aim of the present work is to analyze the relationship between the percentage of the rye terminal heterochromatin bands and the presence and number of univalents in Metaphase I, the Meiotic Index, and the kernel characteristics (shriveled or smooth kernels and weight) in the tricepiro lines Don Rene and FA-L2.
Meiosis in holocentric chromosomes: kinetic activity is randomly restricted to the chromatid ends of sex univalents in Graphosoma italicum (Heteroptera).
These hybrids appear to be entirely sterile because their testes were small and at the first meiotic division mostly univalents were formed.
During diakinesis, diploid chromosomes associate in bivalents; in triploids, univalents, bivalents, and trivalents are formed; and in tetraploids, univalents, bivalents, trivalents, and quadrivalents are formed.
The frequency of univalents and hetermorphic trivalents at meiosis across a wide range of species in the genus also suggests that chromosome number changes are due to breakages, fusions, or translocations (Wahl, 1940; Hoshino, 1981; Hoshino, 1992; Hoshino et al.
On the other hand, sex chromosomes behave as univalents in male meiosis I; they divide equationally at anaphase I, associate at meiosis II through the touch-and-go pairing and segregate reductionally at anaphase II (Ueshima, 1979; Manna, 1984; Papeschi & Bressa, 2007).
The frequency of univalents, bivalents, trivalents, and quadrivalents were determined in at least 10 microspore mother cells (616 total) from each of 50 euploid plants at metaphase I.
Synapsis in eggs from triploid Pacific oyster was characterized by the presence of a mixture of trivalents, bivalents, and univalents, as well as multivalents greater than 3 [ILLUSTRATION FOR FIGURE 1A OMITTED].