Preferential Segregation of Chromosomes from a Trivalent in Haplopappus gracilis

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Science  31 Jul 1964:
Vol. 145, Issue 3631, pp. 511-513
DOI: 10.1126/science.145.3631.511


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.