Response to divergent selection for “high” and “low” survival during the summer period, from July to October, was investigated in juvenile (six-month-old) Pacific oysters, Crassostrea gigas, by producing two sets of progenies in 2002 (Generation 2) and three sets of progenies in 2003 (Generation 3). A strict between-family approach was used and resistance of these selected progenies to summer m...

We examined the effect of incorporation of molecular markers on variability between and within populations in order to maximize heterotic effects and longevity of a maize reciprocal recurrent selection program. Molecular variability was quantified by inter-simple sequence repeat (ISSR) markers between and within the maize populations Cimmyt and Piranão in the 10th cycle of a reciprocal re...

Diallel analysis is a methodology used in the genetic improvement of plants. One its main purposes to provide subsidies for early identification promising crosses development high yielding inbred lines. Several articles have been published diallel analysis, and many recommendations were made either selection certain lines hybrids or competitive However, about validation information predicted by...

genetic values of independent lines with inbreeding have revealed large variability among lines (Bartual and HalThe average effects of inbreeding depression have been measured lauer, 1976; Cornelius and Dudley, 1974, 1976; Obilana extensively in maize (Zea mays L.), but the influence of inbreeding and Hallauer, 1974) and variability in inbreeding depreson genetic variance has not been well stud...

We test the ability of gene flow to alleviate the deleterious effects of inbreeding in a small mammal, the deer mouse (Peromyscus maniculatus). After three generations of sib–sib mating, individuals from three lines of mice were either subject to further inbreeding or were mated with an outbred individual. Subsequently, these mice, plus a control line, which were first generation (F1) mice from...

The role of development in the evolution of postponed senescence is poorly understood despite the existence of a major gerontological theory connecting developmental rate to aging. We investigate the role of developmental rate in the laboratory evolution of aging using 24 distinct populations of Drosophila melanogaster. We have found a significant difference between the larval developmental rat...

A long-term selection experiment for high or low 8-wk BW in White Plymouth Rock chickens was conducted to study effects of selection on BW and correlated characters. Two lines [high (HWS), low (LWS) weight] were established and have undergone 48 generations of selection. The lines were managed to curtail inbreeding and to maintain similar population structures; such is necessary for equitable c...

in order to evaluate some morphological traits of durum wheat genotypes, 18 elite lines selected from advanced regional durum wheat yield trials. these materials along, with two checks dena (durum wheat) and parsi (bread wheat) were examined using rcb design with three replications at isfahan research station in two consecutive cropping season. during the cropping season some trials such as the...

Purdue University Cooperative Extension Service West Lafayette, IN 47907 Author: David S. Buchanan, Oklahoma State University, Reviewers: Kreg Leymaster, USDA MARC, Clay Center NE; Ken Stalder, Univ. of Tennessee, Jackson, TN; William Luce, Oklahoma State Univ., Stillwater, OK Inbreeding is the mating of individuals that are related. In the strict sense, all members of a breed are related. As a...

Records of five inbred lines at the Livestock and Range Research Laboratory were used to evaluate effects of inbreeding and heterozygosity on preweaning traits. Members of each line were descendants of a single founder Hereford bull. A total of 8,065 records of birth weight and 7,380 records of preweaning daily gain and weaning weight were analyzed by derivative-free REML using a model that inc...