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EFFECT OF TRISOMY 6 ON RECOMBINATION IN CHROMOSOME 9 OF MAIZE
A. Ghidoni 1
1 Istituto di Genetica, Università di Milano, Italy
The effect of an additional chromosome 6 upon recombination in chromosome 9 was investigated in maize. Trisomic 6 plants and their disomic sibs, heterozygous for three loci of chromosome 9 (yg, sh and wx), were testcrossed, and recombination in the regions yg–sh and sh–wx was analyzed. Single exchanges in the sh–wx region and double exchanges were more frequent in trisomics, particularly in female flowers.——In reciprocal testcrosses, higher male crossover rates were found for the sh–wx region, and the difference was enhanced in trisomic 6 plants.
Submitted on August 5, 1974Revised on May 8, 1975