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The Journal of Heredity 1988:79(6):473-476
© 1988 The American Genetic Association 79:473-476

other

Linkage Relationships of Seven Enzyme and Two Pigmentation Loci in the Snail Biomphalaria glabrata

M. Mulvey, D. S. Woodruff, and M. P. Carpenter

Savannah River Ecology Laboratory Aiken, South Carolina
The Biology Department and Center for Molecular Genetics, University of California San Diego, La Jolla

Address reprint requests to Dr. Murvey, Savannah River Ecology Laboratory, Drawer E, Aiken, SC 29801.

Abstract

Crossing experiments with inbred stocks of the snail (Biomphalaria glabrata) demonstrated that variants at two loci determining pigmentation and seven enzyme-determining loci exhibited normal Mendelian segregation ratios in F2 progeny. Among 39 pairwise comparisons for joint segregation, there was evidence of genetic linkage between a locus controlling mantle pigmentation (S) and 6-phosphogluconate dehydrogenase (Pgd) and confirmation of a previously described linkage between esterase-2 (Est-2) and catalase (Cat). Recombination fractions were estimated to be 17 ± 4 for S-Pgd and 33 ± 5 for Est-2-Cat. The remaining five loci—Acon-1, Pgm-1, Lap-1, Lap-2, and Pgd—assorted independently. This brings to 17 the number of loci examined for segregation and assortment in this medically important species. As Biomphalaria has a chromosome number n = 18, markers should soon be available for most or all of the linkage groups.


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