What is partial Diallel cross?
What is partial Diallel cross?
The partial diallel is one of many variations of the diallel (Griffing, 1956; Kempthorne and Curnow, 1961; Gardner and Eberhart, 1966) and consists of crosses among two parent groups. This mating system, also called experiment II, design II and factorial design, was proposed by Comstock and Robinson (1948, 1952).
What is diallel mating design?
Diallel mating design is used to evaluate several inbred lines in terms of combining ability variances and effects. Diallel cross refers to mating of selected parents in all possible combinations and evaluation of a set of diallel crosses is known as diallel analysis.
How diallel analysis is helpful for genetic studies?
Diallel crosses are also frequently used in genetic studies for determining mode of inheritance of the examined trait, as well as the number of genes that control the trait and gene effects. Hybrids have 25–30% higher seed yield than varieties. Besides that, hybrids have other advantages over varieties.
What is a Diallel Cross experiment?
A diallel cross is a mating scheme used by plant and animal breeders, as well as geneticists, to investigate the genetic underpinnings of quantitative traits. In a full diallel, all parents are crossed to make hybrids in all possible combinations.
Why partial Diallel cross is important?
Kempthorne and Curnow (1961) suggested the partial diallel cross to allow the evaluation of a greater number of inbred lines in crosses. According to this procedure, each of the n lines in the set are crossed with s other lines of the same set, instead of (n – 1) lines as in the complete diallel.
What is Biparental mating?
Biparental mating permits evaluation of segregating (F2 or later generation) population of an individual cross made between two inbred lines 6. It provides information about two components of genetic variance i.e additive and dominance variance 7. This technique helps in the selection of suitable breeding procedures.
What is Generation mean analysis?
Generation mean analysis (Mather and Jinks, 1982) provides information on the relative importance of average effects of the genes (additive effects), dominance deviations and effects due to nonallelic genetic interactions in determining genotypic values of the individuals and consequently, mean genotypic values of …
What is general combining ability?
General combining ability (GCA) is directly related to the breeding value of a parent and is associated with additive genetic effects, while specific combining ability (SCA) is the relative performance of a cross that is associated with non-additive gene action, predominantly contributed by dominance, epistasis, or …
What is Linex test analysis?
Line × tester analysis is one of the most powerful tools for predicting the general combining ability (GCA) of parents and selecting of suitable parents and crosses with high specific combining ability (SCA) (Rashid et al., 2007).
What is North Carolina design II?
North Carolina Design II : In this design, each member of a group of parents used as males is mated to each member of another group of parents used as females Design II is a factorial mating scheme (Figure 2). It is used to evaluate inbred lines for combining ability.
What is scaling test in genetics?
Scaling test: To predict genetically control of traits in the. beginning only additive [d] and dominance [h] effects are. assumed to be present. The means of the different generations. were utilized for obtaining the various genetic effects.
What is SCA and GCA?
What is a diallel cross used for?
A diallel cross is a mating scheme used by plant and animal breeders, as well as geneticists, to investigate the genetic underpinnings of quantitative traits. In a full diallel, all parents are crossed to make hybrids in all possible combinations.
What is the medical definition of diallel?
Medical Definition of diallel. : relating to or being the crossing of each of several individuals with two or more others in order to determine the relative genetic contribution of each parent to specific characters in the offspring. Comments on diallel.
Diallel mating design is used to evaluate several inbred lines in terms of combining ability variances and effects. Diallel cross refers to mating of selected parents in all possible combinations and evaluation of a set of diallel crosses is known as diallel analysis.
What is the difference between a full diallel and a half diallel?
Full diallels require twice as many crosses and entries in experiments, but allow for testing for maternal and paternal effects. If such “reciprocal” effects are assumed to be negligible, then a half diallel without reciprocals can be effective.