6. Crossing over differences in reciprocal crosses with T5‑9a.

As reported in the 1950 News Letter, plants heterozygous for T5‑9a show a much higher recombination value when used as the ♂ than when used as the ♀ parent. Progeny from these crosses were grown and similar differences were found in reciprocal crosses, regardless of whether the plants tested were from the cross giving high or low crossover values.

C.R. Burnham