univalent chromosome
univalent chromosome
a chromosome that is unpaired during prophase 1 of MEIOSIS and fails to carry out CROSSING OVER with another HOMOLOGOUS CHROMOSOME. Univalent chromosomes occur often in POLYPLOIDS with odd numbers of chromosome sets.Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005