Explanation

Polyploid An organism or its karyotype having more than two genomes called polyploid Polyploidy is three types (i) Autopolyploidy It is the type of polyploidy in which there is the numerical increase of same genome. $e.g.,$ autotriploid (AAA), autotetraploid (AAAA) $e.g.,$ maize, rice, gram (ii) Allopolyploidy It has developed through hybridization between two species followed by doubling of chromosomes, $e.g.,$ AABB $e.g.,$ wheat, cotton, Nicotiana tobacum. Raphanobrassica and Triticale recently allopolyploids (iii) Autoallopolyploidy It is a type of alloplyploidy in which one genome is in more than diploid state commonly autoallopolyploids are hexaploids (AAAABB) $e.g.,$ Helianthus tuberosis