the first step in breeding programs is detecting the genetic diversity in breeding materials. molecular markers help to reduce costs and time in breeding programs. genetic variation in 49 genotypes of tobacco were studied using 12 issr markers, 3 retrotransposon markers and the combination of issr and retrotransposons. one hundred forty seven polymorphic bands were produced using 16 primers. to...

A Mexican hexaploid wild potato species, Solanum demissum (dms), was only used as a female in previous breeding programs. The resulting clones with dms cytoplasm produced abundant, but non-functional pollen. A 170 bp DNA fragment, named Band 1, was originally detected in the F(1) hybrid between dms and S. tuberosum. In this study, the sequenced region was extended to 1,032 bp; nevertheless, it ...

Myostatin or growth and differentiation factor 8 (GDF8), has been known as the factor causing double muscling phenotypes in which a series of mutations make the myostatin protein inactive, hence disabling it to regulate the deposition of muscle fibre. This phenotype happens with high frequency in a breed of sheep known as the Texel. Quantitative trait loci (QTL) studies show that a portion of t...

We have heard about developments in genome sequencing of key Solanaceae family members, but now it is the wild species turn. Wild species provide a rich resource of genetic diversity and have been integral parts of breeding programs, especially for tomato. The following two articles highlight recent developments in the sequencing of two tomato wild species, Solanum pimpinellifolium, the closest...

s with Programs, 32:A-221. Clutton-Brock, T. H., S. D. Albon, & F. E. Guinness. 1988. Reproductive success in male and female red deer. Pp. 325-343 in T. H. Clutton-Brock, ed. Reproductive Success: Studies of Individual Variation in Contrasting Breeding Systems. University of Chicago Press, Chi-

myostatin or growth and differentiation factor 8 (gdf8), has been known as the factor causing double muscling phenotypes in which a series of mutations make the myostatin protein inactive, hence disabling it to regulate the deposition of muscle fibre. this phenotype happens with high frequency in a breed of sheep known as the texel. quantitative trait loci (qtl) studies show that a portion of t...

Emslie While it is difficult to pinpoint exactly when selection indices were first used in the poultry breeding industry, it is generally recognized that “in the late 1940s. . . a few of the breeders began to develop poultry breeding as a business” (Hunton, 1990). Certainly by the mid-50’s, progressive poultry egg breeders were applying index and complex breeding strategies to their selection p...

INTRODUCTION Beef breeding programmes have developed significantly in the last 24 years since the 1 WCGALP. Breeding programs as defined here include the definition of breeding objectives, recording and genetic evaluation programs to develop selection criteria and developments in selection and mating technology to optimize genetic progress for the objective. Available today are tools for the im...