allotetraploid
An allotetraploid is an organism with four sets of chromosomes derived from two different species, formed by interspecific hybridization followed by chromosome doubling. In an initial hybrid between two diploid species, each chromosome set is from a different lineage, often causing sterility because homologous chromosomes fail to pair properly during meiosis. Doubling the chromosome complement creates two complete sets from each parent, enabling pairing within each subgenome and restoring fertility. The resulting organism exhibits disomic inheritance, behaving genetically as two paired chromosome sets.
Allotetraploids are a major class of allopolyploids and often combine traits from both parent species. They
Examples include Brassica napus, an allotetraploid with AACC genomes derived from Brassica rapa (AA) and Brassica