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.
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In 5% of the PMCs, the precocious dissociation of some bivalents and trivalents increased the frequency of the univalents, whereas the remaining 5% of the PMCs showed an increased number of bivalents, possibly due to nonhomologous chromosome pairing or sticking of univalent chromosomes.
double dagger]) Possibly involved nonhomologous pairing or stickiness of univalent chromosomes.