Centromere is the primary constriction on the chromosome, a region at which the sister chromatids are held together.
着丝点是染色体的主缢痕，在这个地方姐妹染色单体连在一起。
Then each chromosome is formed by the two chromatids.
这时每条染色体已是由两条染色单体构成了。
Each chromosome in pachytene actually have been composed of two chromatids.
在粗线期每条染色体实际已由两条染色单体组成。
Following the replication of chromosomes resultant chromatids remain attached at the centromere.
随着染色体的复制，着丝粒始终连接着形成的两个染色单体。
At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.
此时每条染色体由一对染色单体构成，这两条联合的染色体称为四分体。
In diplotene the pairs of chromatids begin to separate from the tetrad formed by the association of homologous chromosomes.
双线期时，配对的染色单体开始从四分体中分离，此时常可见染色体交叉。
Chromatids --- The two parallel strands of chromatin, connected at the centromere, that constitute a chromosome after DNA synthesis.
染色体复制后仍由同一个着丝粒连在一起的两条子染色体。
Centromere --- The primary constriction on the chromosome, a region at which the sister chromatids are held together and at which the kinetochore is formed.
染色体的主缢痕，使姐妹染色单体连在一起，在其两侧各有一个由蛋白构成的动粒。
During diakinesis the sister chromatids of homologous pairs of chromosomes complete their separation and the chromosomes coil tightly shortening and thickening.
在终变期配对的同源染色体中的姐妹染色单体完成分离，染色体变成紧密凝集的状态，缩至最小长度。
During diakinesis the sister chromatids of homologous pairs of chromosomes complete their separation and the chromosomes coil tightly shortening and thickening.
在终变期配对的同源染色体中的姐妹染色单体完成分离，染色体变成紧密凝集的状态，缩至最小长度。
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