Allopolyploidy

Allopolyploidy is a condition in which an organism carries chromosome sets derived from different species, usually after hybridization and chromosome doubling.

Hybridization: Reproduction between genetically distinct populations or species produces hybrid offspring. It brings chromosome sets from different species together in one organism.
G. Ledyard Stebbins: An American evolutionary botanist who developed influential accounts of plant evolution and polyploidy. His work helped establish polyploidy as a major route in plant evolution.
Polyploidy: The condition of having more than two complete sets of chromosomes. Allopolyploidy is the polyploid condition specifically involving genomes from different species.
Hybrid sterility: Reduced or absent fertility in hybrids, often caused by problems during chromosome pairing or gamete formation. Unpaired parental chromosomes can make newly formed hybrids sterile before genome duplication.
Chromosome doubling: An increase in chromosome number that duplicates one or more complete chromosome sets. Doubling can give hybrid chromosomes matching partners for meiosis.
Wheat: A group of domesticated cereal grasses, including bread wheat, whose grains are staple foods worldwide. Bread wheat combines genomes from three ancestral grass lineages through hybridization and duplication.
Autopolyploidy: Polyploidy in which extra chromosome sets come from the same species. It contrasts with allopolyploidy’s chromosome sets from different species.
Subgenome dominance: Unequal gene activity or retention between the component genomes of a polyploid organism. The parental genomes in allopolyploids can contribute unequally to gene expression and evolution.
Meiosis: Cell division that produces haploid reproductive cells through chromosome pairing and segregation. Fertility often depends on whether the hybrid’s chromosomes can pair and segregate.
Bread wheat: The hexaploid wheat species Triticum aestivum, cultivated worldwide for flour and food. Its A, B, and D genomes exemplify allopolyploid formation and persistence.

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