Inheritance and linkage analysis of ten enzyme and blood protein loci in the Japanese brown frog Rana japonica.

In order to clarify the genetic linkage groups of the Japanese brown frog Rana japonica, and compare them with those of other vertebrates, the inheritance of 10 enzyme and blood protein loci was examined in 267 offspring derived from 18 crosses using 10 males heterozygous at these loci. Most of the segregation tests exhibited no significant deviations from the expected normal Mendelian ratios. Of 32 pairs of loci tested for linkage, 29 pairs showed independent assortment in all crosses examined. In the three other locus pairs, between ADH-1 and Alb, IDH-1 and Hb-1, and LDH-B and MPI, all offspring analyzed were parental, and there were no recombinants. These three linkage groups comprising six loci were thus established in R. japonica, whereas no linkage between the other four loci, AAT-1, ADA, GPI, and PEP-A, was observed.