bivalents
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The reduction of chromosomes in the hybrid and the high numbers of bivalents were possibly due to the chromosome of Crambe abyssinica eliminating and the genome of Brassica.
杂种PMC减数分裂中,平均配对构型为0.06Ⅲ+11.26Ⅱ+3.80Ⅰ,二价体数目变化于8~13之间,以10Ⅱ、11Ⅱ、12Ⅱ的细胞出现频率较高,分别为26.60%,23.91%和30.98%,单价体数目变化于0~8个之间。
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Diakinesis bivalents end of some of the homologous chromosomes together only at the end.
终变期末有些二价体的同源染色体只在末端连在一起。
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Centromeres could be identified easily on the bivalents at diplotene, so it was convenient to analyse the karyotype.
结果表明,日本沼虾染色体数n=52,2n=104,据双线期二价体的相对长度、着丝点位置以及形态诸方面的特点分析了核型,共分为A,B,C,D4个染色体组,核型组成是N=37M+4ST+11T;初级精母细胞减数分裂前期I可分为细线期/偶线期、粗线期、双线期和终变期5个时期,双线期的二价体存在弥散阶段,核仁明显,且双线期二价体着丝点清晰,给核型分析带来了方便。
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Meiosis of Nelumbo was normal 5 and chromosome pattern was 8 Ⅱ; and few abnormalities , such as precocious segregation of bivalents at metapha...
莲属两个种之间不存在生殖隔离,仅存在地理隔离,因此把美洲黄莲作为莲的一个亚种处理,也许较目前作为两个独立的种更为恰当。
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We have developed a technique of random-primed tritium labeled DNA extension on the pachytene bivalents of rice-field eels.
采用随机引物,在黄鳝二价体上建立了氚标记引物原位DNA合成技术,并详细探索了该技术的实验条件。
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