Whole-genome duplications (WGDs) are widespread genomic events in eukaryotes that are hypothesized to contribute to the evolutionary success of many lineages, including flowering plants, Saccharomyces yeast, and vertebrates. WGDs generally can be classified into autopolyploids (ploidy increase descended from one species) or allopolyploids (ploidy increase descended from multiple species). Assignment of allopolyploid progenitor species (called subgenomes in the polyploid) is important to understanding the biology and evolution of polyploids, including the asymmetric subgenome evolution following hybridization (biased fractionation). Here, I review the different methodologies used to identify the ancestors of allopolyploid subgenomes, discuss the advantages and disadvantages of these methods, and outline the implications of how these methods affect the subsequent evolutionary analysis of these genomes.

全基因组重复（WGD）是真核生物中广泛存在的基因组事件，据推测有助于许多谱系的进化成功，包括开花植物、酵母菌和脊椎动物。 WGD通常可分为同源多倍体（来自一个物种的倍性增加）或异源多倍体（来自多个物种的倍性增加）。异源多倍体祖先物种（在多倍体中称为亚基因组）的分配对于理解多倍体的生物学和进化非常重要，包括杂交后的不对称亚基因组进化（有偏分馏）。在这里，我回顾了用于识别异源多倍体亚基因组祖先的不同方法，讨论了这些方法的优点和缺点，并概述了这些方法如何影响这些基因组的后续进化分析的含义。