Translocation hetero zygosity and sex ratio in viscum fischeri

Barlow, B.A.; Wiens, D.

Heredity 37(1): 27-40


ISSN/ISBN: 0018-067X
Accession: 006829094

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Male plants of V. fischeri have 2n = 23 and constantly produce 7 bivalents and a multivalent chain of 9 chromosomes at meiosis. Regular assortment results in transmission of 11- and 12-chromosome genomes via the pollen. Female plants have the chromosome number 2n = 22 and are homozygous for the 11-chromosome genome. The multivalent chain in the males is a consequence of reciprocal translocations, one of which was Robertsonian and one of which involved the chromosome carrying the sex determination factors. There is a constant female-predominant sex ratio of approximately 1:2 in V. fischeri, possibly maintained by gamete selection; the genes involved may have been linked with the sex determination mechanism through the translocation system.