来自南美洲的雌性和雄性二倍体及多倍体无尾目动物（两栖纲）的染色体配对

Chromosome pairing in female and male diploid and polyploid anurans (Amphibia) from South America.

作者信息

Rahn I M, Martínez A

出版信息

Can J Genet Cytol. 1983 Oct;25(5):487-94. doi: 10.1139/g83-073.

Abstract

Chromosome pairing in females and males of diploid (2n = 22) and tetraploid (2n = 44) Odontophrynus americanus and diploid Ceratophrys cranwelli (2n = 26) and tetraploid C. ornata (2n = 104) showed that diploid females formed more chiasmata per paired arm than diploid males and polyploids of both sexes. There was a reduction in the level of recombination in female polyploids by forming multivalents with terminal chiasmata. The reduction reflected a change in the genetic control of pairing in females after polyploidization.

摘要

二倍体（2n = 22）和四倍体（2n = 44）美洲齿蟾的雌性和雄性以及二倍体克兰威尔角花蟾（2n = 26）和四倍体华丽角花蟾（2n = 104）的染色体配对显示，二倍体雌性每对染色体臂形成的交叉比二倍体雄性以及两性多倍体更多。雌性多倍体通过形成带有末端交叉的多价体，使重组水平降低。这种降低反映了多倍体化后雌性配对遗传控制的变化。