title: PREFERENTIAL SEGREGATION OF CHROMOSOMES FROM A TRIVALENT IN HAPLOPAPPUS GRACILIS.
abstract: Crosses between plants of Haplopappus gracilis (n = 2) and a race with three pairs of chromosomes (tribivalens) gave a highly fertile five-chromosome hybrid. In both races the chromosomes with the satellites appear homologous, but the other two tribivalens chromosomes pair with the A chromosome (without a satellite) of H. gracilis. Disjunction from the resulting trivalent is preferential: the A chromosome goes to one pole and the two tribivalens chromosomes to the other.
mesh_terms: D002875:Chromosomes; D031206:Haplopappus; D006824:Hybridization, Genetic; D009693:Nucleic Acid Hybridization; D010944:Plants; D012106:Research
keywords: CHROMOSOMES; EXPERIMENTAL LAB STUDY; HYBRIDIZATION; PLANTS