Fig. 1. Polymerase chain reaction product profile of DNA amplified with primer UBC188 in Population 2: (D8R x TM-1) F₁ x TM1. Lanes labeled "F" and "S" represent individual fertile and sterile plants, respectively. Lane "M" is a 100-bp ladder. The arrow indicates the RAPD marker, UBC188₅₀₀, which was present only in the fertile plants.