locking arm

At pachytene stage the X and Y chromosome display an extensive side-by-side pairing segment with decreasing length as meiotic prophase progressed.

此外，X、Y染色体间出现扩大配对，其长度随减数分裂的进行而降低。

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The pairing styles of translocation chromosome in meiosis are partial pairing chain triple valent 71. 09% and chain tetra valent 13. 28%, complete pairing tetravalent is 15.63%.

易位染色体在减数分裂中的配对形式以链状三价体（71.09%）为主，还有链状四价体（13.28%），完全配对的环状四价体占15.63%。

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Normal chromosome pairing between most species and N . tabacum is rare.

大多数的种与红花间的正常染色配对是少见的.

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