Analytical Breeding - Breeding of autotetraploid (4x) crops like potato, alfalfa, etc. presents problems due to the complex segregation patterns at the autotetraploid level. In comparison, breeding at the haploid level of crops like potato is much easier due to much simpler segregation patterns and smaller breeding populations involved.

Haploids of tetraploid (4x) species are called dihaploid since they have two genomes. Potato dihaploids (2x) are fully fertile, and have enough vigour to allow hybridization and selection at this level. The selected dihaploid clones are treated with colchicine to obtain tetraploid clones, which are used as varieties.