secondary constriction

Chromosome 14 , with a secondary constriction on the short arm , is a metacentric chromosome . Only this marker chromosome of Red panda display a very strong positive centromeric C-band which is very similar to that of giant panda 's marker chromosome .

14号染色体为短臂中部具次级缢痕的中着丝粒染色体，是小熊猫的标记染色体，其着丝粒区显示强阳性C-带。

Studies on Cytogenetics of A Patient with Two Chromosomes 9 Secondary Constriction Deletion and Pedigree

一例带有两条9号染色体次缢痕丢失的患者及其家系的细胞遗传学研究

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。

However , the SAT-chromosome and the secondary constriction were not found on any chromosome present .

三种在臂比值和次缢痕的有无、位置方面存在差异。

However the frequencies near the secondary constriction were higher and the phenomenon of unequal SCEs was observed in the experiment .

副缢痕附近SCEs频率较高，且见到不均等交换现象。

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。

A secondary constriction appears at a position on the long arm of chromosome No. 10.It is also the position of the " standard NORs " and C-banding positively stained .

次缢痕在第10对染色体长臂上，亦为C-带染色阳性，并与银染显示的标准NORs相一致。

Two cases were autosomal balanced translocation and two cases were pericentric inversion . The chromosome secondary constriction in one case became wider and the short arms of G team chromosomes in one case became longer .

其中常染色体平衡易位2例，臂间倒位2例，染色体次缢痕增大和G组短臂增加各1例。

In the karyotypes of abnormally growing plants of Vicia faba , frequency of satellite fragments ( SPs ) produced by breakage of secondary constriction ( SC ) of M chromosomes is about 36.63 % ;

在蚕豆异常生长的植株的核型中，由M染色体次缢痕断裂所产生的随体断片高约36.63%；