Importance of polyploidy :

• New varieties and species of various crops like, rice, gram and maize have arisen by autopolyploidy and american cotton, Nicotiana tabacum and wheat have arisen by allopolyploidy.
• Different species of wheat have arisen from the hybrid of wheat and grass by alloautopolyploidy.
• Polyploidy is used to obtain flowers and fruits of large size or of higher yield.