| 单词 | crossing-over |
| 释义 | > as lemmascrossing-over crossing-over n. Biology the formation of a genotype exhibiting characters derived from both parents when the characters are known to be linked; hence also, the interchange of segments between chromatids of homologous pairs of chromosomes which causes this breakdown of linkage. ΘΚΠ the world > life > biology > biological processes > genetic activity > [noun] > changes or actions of genes or chromosomes > cross-over recombination1903 chiasma1911 crossing-over1912 crossover1912 interference1916 1912 T. H. Morgan & E. Cattell in Jrnl. Exper. Zoöl. 13 79 In certain combinations, the relation between linkage and breaking of the linkage (‘crossing-over’ as we shall call it) is shown at once. 1912 T. H. Morgan & E. Cattell in Jrnl. Exper. Zoöl. 13 91 There were seven cases of crossing-over in color, all males, in a total of 872 males. 1937 C. D. Darlington Rec. Adv. in Cytol. (ed. 2) vii. 291 In ‘asynaptic’ maize which has as a rule no pairing of chromosomes at meiosis, the progeny nevertheless show the results of normal crossing-over. 1949 C. D. Darlington & K. Mather Elements of Genetics v. 110 A so-called asynaptic gene often..produces a general reduction in the crossing-over of all the chromosome pairs when homozygous. < as lemmas |
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