(2)次缢痕(secondary constriction):染色体上除主缢痕以外的其它浅缢缩的部分,它的数目、位置和大小是某些染色体固定的形态特征,因此可作为鉴别染色体的标志。
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在染色体上也可看到其他的收缩凹陷处,称为次级缢痕(secondary constriction)。有些染色体的一端还可有球形小体,称随体(satellite),多见于近端着丝粒染色体。
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... 主缢痕 primary constriction 副缢痕 secondary constriction 核仁组织区 nucleolar organizing region, NOR ...
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The secondary constriction has been observed on the centromere region of the chromosome No.
染色体短臂近着丝粒区观察到次缢痕。
There were 17 cases of chromosome polymorphism, accounting for 9.83% of all abnormal karyotypes. It contains Y chromosome, secondary constriction, and variation of satellites.
染色体多态性17例,占异常核型的9.83%,主要包括Y染色体多态性、次缢痕和随体的变异。
It is presumed that the repeated DNA sequences of the heterochromatin near the secondary constriction might be formed gradually in the process of evolution through unequal SCEs.
推测副缢痕附近异染色质的DNA重复序列可能是在进化过程中通过染色单体不均等交换而逐渐形成。
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