One partial asynaptic mutant of Vicia faba (2n=12) was isolated from M2 population of 0.2% EMS (Ethyl Methane Sulphonate) treated seeds. The mutant was designated as 'medium strong asynaptic mutant'. At diakinesis/metaphase I of meiosis number of univalents ranged from 2-8 in 90% of PMCs in M2 and 2-4 in 44% of PMCs in M3. There was a significant decrease in the number of chiasmata in this plant as compared to the control. The metacentric chromosome pair did not show univalence. The pollen fertility was also reduced by 35%. The inheritance of this asynaptic mutant was probably of monogenic recessive type.