Permanent Translocation Heterozygosity and Sex Determination in East African Mistletoes
- 28 March 1975
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 187 (4182) , 1208-1209
- https://doi.org/10.1126/science.187.4182.1208
Abstract
Viscum fischeri has 2n = 23 chromosomes in male plants. These fornm 7 bivalents and a translocation chain of 9 chromosomes during meiosis. Pollen with 11-and 12-chromosome genomes is thus produced. Female plants have 2n = 22 chromosomes and produce 11 bivalents during meiosis. Sex determination is technically a rare multiple X-multiple Y type, but more importantly it provides the mechanism whereby permanent translocation heterozygosity is maintained in the system. In a second species, Viscum engleri, male plants have 2n=28 chromosomes associating as 11 bivalents and a ring of 6 chomosomes at meiosis.Keywords
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