| 释义 |
heteroploid, a. (and n.)|ˈhɛtərəʊplɔɪd|
[a. G. heteroploid (H. Winkler 1916, in Zeitschr. f. Bot. VIII. 422), f. hetero- + -ploid.]
Having a chromosome number that is neither the haploid nor the diploid number characteristic of the species; freq., in restricted sense, = aneuploid a. (see quot. 1928); also as n., a heteroploid organism. Hence ˈheteroploidy, the condition of being heteroploid.
1926T. H. Morgan Theory Gene xii. 172 In so far as the addition of one or more chromosomes to, or loss from, a given group produces a new number, the word heteroploid has been used. Ibid. 176 In contrast to these triplo-types of Drosophila there is another heteroploid type..in which one of the small chromosomes is absent. Ibid. 188 The heteroploids are not so viable as the balanced types from which they arise. Ibid., The occurrence of heteroploidy must be regarded as a significant genetic event. 1928C. A. Jørgensen in Jrnl. Genetics XIX. 135 The term heteroploid was introduced by Winkler in 1916 to designate..not only the straight numbers 3n, 4n, 5n, etc., but also 2n + 1, 2n + 2, 3n - 1, etc. The heteroploid numbers were divided by Täckholm (1922) into euploid..and aneuploid... I prefer to restrict the term heteroploid to the series n, 3n, 4n, 5n, etc...and to use the term aploid for the irregular numbers. 1934Nature 3 Nov. 708/2 In the heteroploid series, all having 25 chromosomes, the anatomical differences..were due to the genic constitution of the extra chromosome. 1955J. B. & H. D. Hill Genetics & Human Heredity xvii. 331 Although rare in animals, heteroploidy occurs frequently in plants. 1956Nature 25 Feb. 384/2 It is of interest to try to find whether the heteroploid cells appear only in certain tissues or if they can arise anywhere in the young embryos. |
单词 unquailing 释义 unquailing, ppl. a.(un-1 10.)1836Whittier Mem. T. Shipley 49 The unqu......