1. X chromosome was the second largest submetacentric chromosome and Y was the smallest acrocentric chromosome in 1 pair sex chromosome. 1对性染色体中 ，X染色体为 1条第二大的亚中部着丝点染色体 ，Y染色体为最小的端部着丝点染色体。
2. X chromosome was the second largest submetacentric chromosome and Y was the smallest acrocentric chromosome in 1 pair sex chromosome. 1对性染色体中 ，X染色体为 1条第二大的亚中部着丝点染色体 ，Y染色体为最小的端部着丝点染色体。
3. X chromosome was the second largest submetacentric chromosome and Y was the smallest acrocentric chromosome in 1 pair sex chromosome. 1对性染色体中，X染色体为1条第二大的亚中部着丝点染色体，Y染色体为最小的端部着丝点染色体。
4. Partial chromosomes happened abnormally during pollen mother cells meiosis, which included chromosome chain, chromosome loop, lagging chromosome and chromosome unequal distribution. 丽椪2号花粉母细胞在减数分裂期染色体行为发生了异常，出现较高频率的染色体链及少部分的染色体环和落后染色体。
5. B chromosome (accessory chromosome) An extra chromosome found in addition to the normal number of chromosomes characteristic of a species( the A chromosomes). 在物种正常染色体（A染色体）之外，额外发现的染色体。
