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R T Dillon

Publications and source records attributed to R T Dillon.

9 recordsLinked to original sources
PubMed1986

Inheritance of isozyme phenotype at three loci in the freshwater snail, Goniobasis proxima: mother-offspring analysis and an artificial introduction.

A good deal of interest has recently focused on the genetics of Goniobasis populations, with isozyme frequencies often a primary tool. I sampled 72 Goniobasis proxima from a population naturally polymorphic at three enzyme loci, Gpi, Opdh, and Est, reared each in isolation, and electrophoretically analyzed 14 sibships produced. Since females apparently mate but once in their lifetimes, it was possible to infer paternal genotype and demonstrate that inheritance is Mendelian at these three loci. The three loci appear to assort independently. A pair of G. proxima populations fixed for alternative alleles at the three loci has been introduced into a small spring. Triply heterozygous F1 hybrids have been recovered, although at a low frequency.

Alleles↗
PubMedDate not supplied

The inheritance of albinism in a freshwater snail, Physa heterostropha.

Complementation tests revealed that albinism in four laboratory strains of Physa (Physella) heterostropha pomilia resulted from two recessive, nonallelic genes. F2 dihybrid progeny displayed the 9:7 ratio classically associated with reciprocal recessive epistasis between unlinked loci. This offers a contrast to the situation in the better known planorbid snails and provides a valuable tool for the study of reproductive biology in these facultatively self-fertilizing hermaphrodites.

Animals↗