enzyme electrophoresis was used to measure genetic variation within, and divergence among, three generations of recently bred synthetic alfalfa generations (syn1, syn2, and syn3) originating from a polycross of 12 selected parents and several cultivars. three isozyme loci, exhibiting tetrasomic inheritance in 10-day seedlings, were detected from five enzymatic systems analyzed by polyacryla...

BACKGROUND AND AIMS The genetic variation and divergence estimated by allozyme analysis were used to reveal the evolutionary history of Castanopsis carlesii in Taiwan. Two major questions were discussed concerning evolutionary issues: where are the diversity centres, and where are the most genetically divergent sites in Taiwan? METHODS Twenty-two populations of C. carlesii were sampled throug...

Abstract We use Helianthemum oelandicum subsp. as a model for studies of mechanisms shaping the diversity in rapidly radiating lineage H. aggregate. Locally, correlations between drainage conditions (using GIS to measure variation micro-topography on more or less horizontal bedrock) and frequency alleles Mendelian genes pubescence indicated that hairs are markers adaptation unique environmental...

Restriction map polymorphism in a 13-kb region of the Zw locus in Drosophila melanogaster was investigated for 64 X chromosome lines with seven 6-cutter and ten 4-cutter restriction enzymes. A total of 203 restriction sites were scored, of which 20 were found to be polymorphic. The estimated nucleotide variation for this region for overall data (pi = 0.003 and 0.001, and theta = 0.003 and 0.002...

A total of 305 individuals from a hybrid population of North American tree frogs was characterized for allozyme and mitochondrial DNA (mtDNA) genotype. Species-specific mating behaviors had suggested the potential for directional hybridization, in which matings between Hyla cinerea males and Hyla gratiosa females numerically predominate over the reciprocal combination. Such directional bias lea...

DNA variation in a 4.7-kb region of the cytosolic phosphoglucose isomerase (PgiC) locus was investigated for 21 ecotypes of Arabidopsis thaliana. The estimated nucleotide diversity was 0.0038, which was one-third of those in previously investigated loci. Since most of the nucleotide variations (93%) were singleton and doubleton, Tajima's test statistic was significantly negative. About 50% of n...