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asynapsis
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asynapsis
asynapsis Biol. (æ-, eɪsɪˈnæpsɪs) [f. a- prefix 14 + synapsis.] Absence of synapsis; failure of chromosomes to pair in meiosis. Hence asyˈnaptic a.1930 G. W. Beadle in Cornell Univ. Agr. Exp. Sta. Mem. CXXIX. (title) Genetical and Cytological Studies of Mendelian Asynapsis in Zea mays. 1937 C. D. Da...
Oxford English Dictionary
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Meiotic recombination checkpoint
However the asynapsis does not happen only within sex chromosomes, and such transcription regulation was suspended until it was further expanded to all
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crossing
▪ I. crossing, vbl. n. (ˈkrɒsɪŋ, ˈkrɔːs-) [f. cross v.] 1. The marking with or making the sign of the cross.1530 Palsgr. 211/1 Crossyng, croisee. 1548–9 (Mar.) Bk. Com. Prayer, Offices 37 As touching kneeling, crossing..and other gestures. 1884 Evangelical Mag. Jan. 9 As many genuflexions..and as ma...
Oxford English Dictionary
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多线染色体
多线染色体一般存在于间期的细胞中,双翅目昆虫唾腺细胞中组成多线染色体的每条臂宽约20微米,长约0.5毫米,约为染色体长度的100倍,每条臂都是由上千条DNA组成,即约十次DNA复制的产物,同源染色体一般会紧密地互相配对(somatic synapsis),但部分区域可能有分开(asynapsis)的情形
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