Another bottleneck to the exploitation of induced crop mutations is the predominantly recessive nature of mutations. The consequence of this is that the expression of the desired phenotype is masked if the alleles are in a heterozygous state. Attaining homozygousity at the mutated alleles so that the desired phenotypes can manifest requires several cycles of selfing and hence added expense. Again, totipotency is exploited to produce doubled haploids (DHs), i.e., whole plant that arise from the doubling of the chromosome number of gametic cells, pollens and egg cells, prior to their regeneration [99,100].