Lin Y J
Cytobios. 1982;33(129):7-14.
In Rhoeo spathacea var. variegata (2n = 2x = 12), the most frequent meiotic configuration was the chain-of-12 chromosomes (36%) and the second most frequent was the ring-of-12 chromosomes (25.6%). All six possible two-chain situations and eleven of the twelve possible three-chain situations were observed. A maximum of five chains was observed in four cells. The size of chains ranged from on through twelve chromosomes. The mean number of chiasma failures was 1.36 +/- 0.07 per cell and 0.1133 per pair of chromosome arms. Because the observed frequencies of various configurations agree with the expected, which were calculated under the assumption that chiasma failure is equally likely at each of the twelve positions around the ring, it was concluded that chiasma failures occurred at random among the arm-positions. Due to the lengths of arm-pairs in the ring vary considerably, the randomness may mean that chiasma formation was restricted to small terminal regions on all chromosomes.
在紫露草（2n = 2x = 12）中，最常见的减数分裂构型是12条染色体的链状结构（36%），其次是12条染色体的环状结构（25.6%）。观察到了所有六种可能的双链情况以及12种可能的三链情况中的11种。在四个细胞中观察到最多五条链。链的大小范围从一条到十二条染色体。每个细胞交叉失败的平均数量为1.36±0.07，每条染色体臂对为0.1133。由于观察到的各种构型的频率与预期相符，预期是在假设交叉失败在环周围十二个位置中的每个位置发生的可能性相等的情况下计算得出的，因此得出结论，交叉失败在臂位置之间随机发生。由于环中染色体臂对的长度差异很大，这种随机性可能意味着交叉形成仅限于所有染色体上的小末端区域。
