nullisomicadj.n.

Brit.

/nʌlɪˈsəʊmɪk/, U.S.

/ˌnələˈsoʊmɪk/

Forms: 1900s– nullisomic, 1900s– nullosomic Brit.

/nʌlə(ʊ)ˈsəʊmɪk/, U.S.

/ˌnələˈsoʊmɪk/.

Origin: Formed within English, by compounding. Etymons: null adj., -o- connective, -somic comb. form.

Etymology: Originally < null adj. + -o- connective + -somic comb. form, after monosomic adj., with first element subsequently remodelled after nulli- comb. form.

Genetics.

A. adj.

Designating, relating to, or characterized by the condition of having an aneuploid chromosome complement lacking a particular pair or polyploid set of homologous chromosomes. Also (of a gamete): lacking a chromosome; producing a nullisomic individual.Occasionally also applied to homologous chromosomes lacking the same segment in all copies.

ΘΚΠ

the world > life > biology > biological processes > genetic activity > genetic components > [adjective] > chromosome > chromosomes in respect of meiosis

non-homologous1883

quadrivalent1898

univalent1898

bivalent1899

plurivalent1901

homologous1903

heterotropic1905

monovalent1906

heteromorphic1917

homomorphic1917

trivalent1921

multivalent1929

sexivalent1931

nullisomic1932

quinquevalent1935

1932 W. E. Lammerts in Genetics 17 691 These are examples of the nullosomic condition.

1944 Genetics 29 233 Some of these have been nullisomic types.

1973 G. S. Khush Cytogenetics Aneuploids i. 3 Kihara (1924) and Winge (1924) were the first to report the nullisomic plants of wheat.

1992 Molecular & Gen. Genetics 228 482 Gametes nullisomic or disomic for each of the six chromosomes occur at appreciable frequency.

1998 Proc. National Acad. Sci. U.S.A. 95 6258/2 (caption) Four types of gametes are obtained: normal, disomic, and nullisomic for the distal region of MMU16, and balanced.

B. n.

A nullisomic individual or variety.

ΘΚΠ

the world > life > biology > biological processes > genetic activity > genetic components > [noun] > chromosome > chromosomes in respect of meiosis

trivalency1888

zygosome1905

bivalence1909

zygonema1911

trivalent1922

quadrivalent1923

quinquevalent1926

multivalent1929

nullisomic1932

bivalent1937

nullisome1944

1932 W. E. Lammerts in Genetics 17 694 In the hybrid population the nullosomics were readily recognized.

1941 Genetics 26 167 (heading) Nullisomics in Triticum vulgare.

1968 R. Rieger et al. Gloss. Genetics & Cytogenetics 319 Normally, nullisomics (or nullisomes) cannot survive in diploids.

1997 New Phytologist 137 20/1 He was also able to produce a complete set of compensating aneuploids in which the absence of a chromosome pair, as in a nullisomic, could be counterbalanced by increasing the dosage of a related homoeologous chromosome to four.

This entry has been updated (OED Third Edition, December 2003; most recently modified version published online March 2022).

单词	nullisomic
释义	nullisomicadj.n. Brit. /nʌlɪˈsəʊmɪk/, U.S. /ˌnələˈsoʊmɪk/ Forms: 1900s– nullisomic, 1900s– nullosomic Brit. /nʌlə(ʊ)ˈsəʊmɪk/, U.S. /ˌnələˈsoʊmɪk/. Origin: Formed within English, by compounding. Etymons: null adj., -o- connective, -somic comb. form. Etymology: Originally < null adj. + -o- connective + -somic comb. form, after monosomic adj., with first element subsequently remodelled after nulli- comb. form. Genetics. A. adj. Designating, relating to, or characterized by the condition of having an aneuploid chromosome complement lacking a particular pair or polyploid set of homologous chromosomes. Also (of a gamete): lacking a chromosome; producing a nullisomic individual.Occasionally also applied to homologous chromosomes lacking the same segment in all copies. ΘΚΠ the world > life > biology > biological processes > genetic activity > genetic components > [adjective] > chromosome > chromosomes in respect of meiosis non-homologous1883 quadrivalent1898 univalent1898 bivalent1899 plurivalent1901 homologous1903 heterotropic1905 monovalent1906 heteromorphic1917 homomorphic1917 trivalent1921 multivalent1929 sexivalent1931 nullisomic1932 quinquevalent1935 1932 W. E. Lammerts in Genetics 17 691 These are examples of the nullosomic condition. 1944 Genetics 29 233 Some of these have been nullisomic types. 1973 G. S. Khush Cytogenetics Aneuploids i. 3 Kihara (1924) and Winge (1924) were the first to report the nullisomic plants of wheat. 1992 Molecular & Gen. Genetics 228 482 Gametes nullisomic or disomic for each of the six chromosomes occur at appreciable frequency. 1998 Proc. National Acad. Sci. U.S.A. 95 6258/2 (caption) Four types of gametes are obtained: normal, disomic, and nullisomic for the distal region of MMU16, and balanced. B. n. A nullisomic individual or variety. ΘΚΠ the world > life > biology > biological processes > genetic activity > genetic components > [noun] > chromosome > chromosomes in respect of meiosis trivalency1888 zygosome1905 bivalence1909 zygonema1911 trivalent1922 quadrivalent1923 quinquevalent1926 multivalent1929 nullisomic1932 bivalent1937 nullisome1944 1932 W. E. Lammerts in Genetics 17 694 In the hybrid population the nullosomics were readily recognized. 1941 Genetics 26 167 (heading) Nullisomics in Triticum vulgare. 1968 R. Rieger et al. Gloss. Genetics & Cytogenetics 319 Normally, nullisomics (or nullisomes) cannot survive in diploids. 1997 New Phytologist 137 20/1 He was also able to produce a complete set of compensating aneuploids in which the absence of a chromosome pair, as in a nullisomic, could be counterbalanced by increasing the dosage of a related homoeologous chromosome to four. This entry has been updated (OED Third Edition, December 2003; most recently modified version published online March 2022). < adj.n.1932
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