This article reports the marker-assisted introgression of favorable alleles at three quantitative trait loci (QTL) for earliness and grain yield among maize elite lines. The QTL were originally detected in 1992 by means of ANOVA in a population of 96 recombinant inbred lines (RILs). Introgression started from a selected RIL, which was crossed three times to one of the original parents and then ...

1 Background and Aims Reduction in offspring fitness resulting from mating between 2 neighbors is interpreted as biparental inbreeding depression. However, little is known 3 about the relationship between the genetic relatedness of parents and the biparental 4 inbreeding depression in their progeny in natural populations. Here, the effect of kinship 5 between mates on the fitness of their proge...

Twenty one F2 progenies derived from a 7×7 diallel crosses along with parents were evaluated for grain yield, flowering and maturity time. Due to significant genotypic effects for all traits, genetic analyses were performed on F2 progenies including analyses of combining ability and genetic components. The Analysis of variance revealed that both additive and non-additive genetic effects were in...

Maintenance of genetic diversity among breeding lines is important in selective breeding and stock management. The Russian Honey Bee Breeding Program has strived to maintain high levels of heterozygosity among its breeding lines since its inception in 1997. After numerous rounds of selection for resistance to tracheal and varroa mites and improved honey production, 18 lines were selected as the...

The level of polymorphism among twelve selected progenies of Gymnema sylvestre was investigated through AFLP markers by multiplexing PCR reactions using 64 (8x8) primer combinations. Fourteen primer combinations were selected as the most suitable combination for G. sylvestre. Analysis of the 12 progenies with these 14 primer pairs produced 1689 fragments of which 972 (57.5%) were polymorphic an...

Grain yield is strongly influenced by the environment, has polygenic and complex inheritance, and is a key trait in the selection and recommendation of cultivars. Breeding programs should efficiently explore the genetic variability resulting from crosses by selecting the most appropriate method for breeding in segregating populations. The goal of this study was to evaluate and compare the genet...

Impact of hybridization and irradiation in isolation of superior segregants in four crosses of desi cotton were studied and compared between F2 and F2M2 progenies. The F2M2 progenies of four crosses recorded higher per cent of superior segregants compared to F2 progenies for boll number, boll weight and halo length excepting in KS-16 x MB-3200 cross. Out of four F2M2 progenies, RDC-53 x 9747 cr...

Sexually selected traits are expected to evolve to a point where their positive effect on reproductive success is counterbalanced by their negative effect on survival. At the genetic level, such a trade-off implies antagonistic pleiotropy between survival and the expression of sexually selected traits. Yet, the consequences of such a genetic architecture have been largely overlooked in studies ...

As part of a series of studies investigating the genetic basis of prolificacy in the non-inbred QS strain of mice, a line has been selected for increased average litter size over the first 5 litters, and seven sublines have been created by full-sib inbreeding with selection for litter size. Six generations of selection have resulted in an increase of average litter size from 16.0 to 18.1, indic...

A pedigree file consisting of 5860 individuals, 167 sires and 1582 dams collected at Makooei sheep breeding station (MSBS) during a period of 24 years (1990 to 2013) was used to calculate the inbreeding coefficients to reveal any probable effects of inbreeding (F) on the studied traits. The studied traits were classified to the five main groups including body weight, Kleiber ratio, body measure...