Evidence for the single phase pairing theory of meiosis.
The segregation pattern of an attached X chromosome with several Y-autosome translocations conflicts with the expectations based on the distributive pairing hypothesis because the chromosomes segregating from the translocation configuration include both exchange and non-exchange chromosomes. The results of the second experiment involving three compound chromosomes go even further; they suggest that the essential association which determines the segregation of nonhomologous elements is in fact set up prior to the time of crossing over.
D000818:Animals; D002875:Chromosomes; D003434:Crossing Over, Genetic; D004330:Drosophila; D005260:Female; D008297:Male; D008540:Meiosis; D008954:Models, Biological; D011336:Probability; D012730:Sex Chromosomes; D014178:Translocation, Genetic