| 单词 | a chromosome |
| 释义 | > as lemmasA chromosome A chromosome n. Genetics (a) a chromosome reckoned as the first in a classification varying from author to author (now disused); (b) a chromosome of the set which normally occurs in all the members of a species. ΚΠ 1909 Amer. Naturalist 43 243 For each pair in the cells of a given individual there is a homologous pair in the cells of other individuals of the same species.... We may designate one of these pairs as A chromosomes, a second as B chromosomes, etc., the same pairs as a rule being found in different individuals of the same species. 1927 Amer. Jrnl. Bot. 14 80 The A-chromosomes are shown in this nucleus in the lower part of fig. 15. The second large pair (B-chromosomes) are represented in figure 20. 1928 L. F. Randolph in Anat. Rec. 41 102 In maize have been found supernumerary chromosomes of three types: a) Duplicates of members of the typical set... Type-A chromosomes appear in the progeny of triploids crossed with diploids.] 1941 Genetics 26 609 In somatic metaphases the B chromosomes are readily distinguishable from the A chromosomes. 1977 I. H. Herskowitz Princ. Genetics (ed. 2) xix. 465 A chromosomes will synapse with similar, but nonhomologous, B chromosomes. 2009 J. A. Coyne Why Evol. is True 242 The plant arising from this union will have eleven chromosomes. And it will be sterile, for while each A chromosome has a pairing partner, none of the B chromosomes do. < as lemmas |
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