The Gm-Piota linkage group is firmly established. A heterogeneity of recombination fraction amongst males of different Piota types has now become very likely. The major differences seem to be between the Piota (z) and other alleles of the Pi system. A chromosomal deletion, inversion or a regulatory (rec) locus in linkage disequilibrium with the Piota locus offer possible explanations.

DOI: 10.1111/j.1469-1809.1975.tb00106.x
Version: za2963e q8za5 q8zb8 q8zcb q8zd4 q8ze8 q8zfd q8zge