HE colors of horses have long been a subject of interest to owners and T breeders of horses as well as to scientists and much information about them is found in the stud-book records of particular breeds. Attempts to use this information in framing explanations of the observed results of matings within or between different color varieties have been made repeatedly since the rise of genetics at ...

Gray horses are born colored, and they then gradually lose their hair pigmentation. Tremendous progress has been made in identifying the genes responsible for graying with age in horses in recent years. Results show that gray coat color in horses is caused by a 4.6-kb duplication in intron 6 of the syntaxin 17 gene (STX17), which constitutes a cis-acting-regulatory mutation. However, little is ...

The rate and average effects of spontaneous deleterious mutations are important determinants of the evolution of breeding systems and of the vulnerability of small populations to extinction. Nevertheless, few attempts have been made to estimate the properties of such mutations, and those studies that have been performed have been extremely labor intensive, relying on long-term, laboratory mutat...

Identification of mutations in an FGF receptor gene underlying scale loss in a zebrafish mutant, as well as the domesticated mirror carp breed, emphasises the role of genetic redundancy as a facilitator of evolutionary change and has implications for the molecular basis of morphological evolution.

HE existence of variation among the individual members of a population T has been recognized for centuries ; the biological importance of this variation has begun to be understood only in the past few decades. Formerly the type specimen was regarded as representing the species ; now it is realized that adequate representation is obtainable only through a series of specimens. Population genetici...

Time to maturity is a critical trait in sorghum (Sorghum bicolor) breeding, as it determines whether a variety can be grown in a particular cropping system or ecosystem. Understanding the nucleotide variation and the mechanisms of molecular evolution of the maturity genes would be helpful for breeding programs. In this study, we analyzed the nucleotide diversity of Ma3, an important maturity ge...

Objective. The aim of this paper is to analyze the frequency of the mdr1-1D mutation of the MDR1 gene in a dog sample of the Uruguayan Cimarron breed with the objective of increasing the knowledge of this breed’s genome. Materials and methods. Thirty-six animals of this breed were analyzed. The MDR1 gene region, which includes the location where the mutation would be present, was amplified by P...

This report represents a continuation of our laboratory's effort to understand the major phenomena associated with P-M dysgenesis-mediated transformation in Drosophila. A group of stable transformants are characterized with respect to rosy gene expression. Stable, true-breeding, line-specific variants in gene expression are described. These are shown to be associated with single transposons pre...

R.J. Hawken, R.L. Sapp, R. Okimoto, J. Chen, R. Borg, C-H. Huang, T. Wing, C. Wang, J. Henshall, and M. Abrahamsen Cobb-Vantress, Siloam Springs, Arkansas, 72761, USA SUMMARY Cobb-Vantress is one of the leading global suppliers of broiler breeding stock, with products distributed in more than 100 countries. Cobb has continually invested in new technologies to consistently deliver genetic improv...