Marker sorting and mapping was performed with all the available genotype data simultaneously with the aim of constructing one pure AFLP dataset (A-set) for the larger subset of individuals and one mixed SNP-AFLP dataset (S+A-set) intended for the smaller subset. Because the studied full-sib family was generated by two non-inbred and highly heterozygotic parents, a two-way pseudo-testcross mappi...

The combination of QTL mapping studies of synthetic lines and association mapping studies of natural diversity represents an opportunity to throw light on the genetically based variation of quantitative traits. With the positional information provided through quantitative trait locus (QTL) mapping, which often leads to wide intervals encompassing numerous genes, it is now feasible to directly t...

FRIESEN (1936) induced crossing over in Drosophila males by X rays and found that most of the exchanges were in a preferred region, the complementary crossover classes were very unequal, and the percent recombination varied greatly from individual to individual. According to him, the data 'were sufficient to demonstrate the occurrence of spermatogonial crossing over. WHITTINGHILL (1937) found t...

Genetic maps now can be constructed using thousands of genomewide single nucleotide polymorphisms (SNps) for identification of markers closely associated with agronomic traits. A diploid mapping population for potato (Solanum tuberosum L.) was developed from a pseudo-testcross between a homozygous line S. tuberosum Group phureja DM 1-3 516 r44 and a heterozygous outcrossing S. tuberosum Group T...

Genomic exclusion, an unusual cytogenetic sequence during mating in Tetrahymena pyriformis, results in the production of homozygous germinal nuclei by the diploidization of haploid nuclei following meiosis. A method is presented for selecting cells that have made new somatic nuclei from these homozygous germinal nuclei, a step necessary for phenotypic expression of new mutations; this variation...

The chorion patterns produced by progeny from crosses that were used to define the linked gene clusters, C h 1, C h 2 and C h 3 (strain C108 us. strain Ascoli) , were examined by two-dimensional gel electrophoresis (isoelectric focusing us. SDS/urea). Approximately 60 proteins were assigned to four previously defined chorion classes, A, B, C and H,, believed to represent the products of related...

Agricultural Organization of the United Nations, 2000). Apart from factors such as crop rotation and type of N Maize (Zea mays L.) cultivars with improved N-use efficiency would be beneficial for low-input production systems. Our objective fertilizer and its application, crop cultivars with imwas to estimate quantitative genetic parameters to optimize breeding proved N-use efficiency have much ...

Using Cockerham’s approach of orthogonal scales, we develop genetic models for the effect of an arbitrary number of multiallelic quantitative trait loci (QTLs) or neutral marker loci (NMLs) upon any number of quantitative traits. These models allow the unbiased estimation of the contributions of a set of marker loci to the additive and dominance variances and covariances among traits in a rando...

The results of more than 300 painvise examinations of biochemical loci for joint segregation in brook trout (Salvelinus fontimlis) and in the hybridized genome of lake trout (S. namaycush) x brook trout are summarized. Nineteen loci have been assigned to the following eight linkage groupings on the basis of nonrandom assortment, including cases of both classical linkage and pseudolinkage: ODH w...