Abstract
Adjacent-1 duplication-deficiencies (dp-dfs) are readily recovered from most heterozygous translocations in Gossypium hirsutum L., but frequencies of specific cytotypes differ widely in progenies from heterozygote (♀) x standard crosses. Surprisingly, these frequencies seem to be unrelated to the primary (postmeiotic) frequencies predicted by metaphase I configurations or to the proportion of the chromosome arm that is duplicate or deficient. Deficiencies and duplications from different translocations involving the same arm, as well as the two complementary dp-dfs from the same translocation, seldom exhibit similar frequencies. We conclude that the frequency of each of 101 different adjacent-1 cytotypes is largely idiosyncratic and may depend in part on interactions between the specific chromosome regions that are respectively trisegmental and monosegmental. Few, if any, of these interactions can be between homoeologues of the Ah and Dh genomes. Adjacent-2 dp-dfs are seldom recovered, even if they involve chromosomes that are readily tolerated in monosomic condition. Comparison of monosomes and telosomes with deficiencies suggests that some chromosomes and chromosome regions may be more dosage-sensitive than others, but their identification is not strongly supported by these data.
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Selected References
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- Endrizzi J. E. Alternate-1 and alternate-2 disjunctions in heterozygous reciprocal translocations. Genetics. 1974 May;77(1):55–60. doi: 10.1093/genetics/77.1.55. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lima-de-Faria A. Classification of genes, rearrangements and chromosomes according to the chromosome field. Hereditas. 1980;93(1):1–46. doi: 10.1111/j.1601-5223.1980.tb01043.x. [DOI] [PubMed] [Google Scholar]