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1·Homologous chromosome pairing in both F_1 and F_2 PMC's was observed.

对F_1和F_2花粉母细胞(PMC)的部分同源染色体配对进行了观察。

2·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。

3·Frequencies of bivalents in the amphidiploids tended to increase obviously in comparison with the expected chromosome pairing model of the meiosis.

与期望染色体配对模式相比，双二倍体中二价体出现的频率有明显增大的趋势。