2021
DOI: 10.1101/2021.07.19.452883
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Inference of polyploid origin and inheritance mode from population genomic data

Abstract: Summary/AbstractWhole-genome duplications yield varied chromosomal pairing patterns, ranging from strictly bivalent to multivalent, resulting in disomic and polysomic inheritance modes. In the bivalent case, homeologous chromosomes form pairs, where in a multivalent pattern all copies are homologous and are therefore free to pair and recombine. As sufficient sequencing data is more readily available than high-quality cytological assessments of meiotic behavior or population genetic assessment of allelic segreg… Show more

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“…We also observed the presence of two loci with a marked tendency to disomy with a few unexpected allele combinations, pointing to a possible imperfect preferential pairing expected at intermediate stages of functional diploidization [10,11]; this coexistence of different ploidy levels was previously described in other organisms. In plants, for example, the co-existence of different segregation patterns (e.g., tetrasomic and disomic) with different intermediate degrees of preferential pairing among chromosomes provides evidence of a process of functional reduction of ploidy which reasonably cannot occur simultaneously throughout the genome, but which is the result of a progressive differentiation [11,25].…”
Section: Discussionmentioning
confidence: 99%
“…We also observed the presence of two loci with a marked tendency to disomy with a few unexpected allele combinations, pointing to a possible imperfect preferential pairing expected at intermediate stages of functional diploidization [10,11]; this coexistence of different ploidy levels was previously described in other organisms. In plants, for example, the co-existence of different segregation patterns (e.g., tetrasomic and disomic) with different intermediate degrees of preferential pairing among chromosomes provides evidence of a process of functional reduction of ploidy which reasonably cannot occur simultaneously throughout the genome, but which is the result of a progressive differentiation [11,25].…”
Section: Discussionmentioning
confidence: 99%