title: Chromosome pairing in female and male diploid and polyploid anurans (Amphibia) from South America.
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.
mesh_terms: D000818:Animals; D001001:Anura / Q000235:genetics*; D002875:Chromosomes / Q000648:ultrastructure; D004171:Diploidy; D005260:Female; D008297:Male; D008540:Meiosis; D011123:Polyploidy