Introduccion a la Genetica Cuantitativa by D. S. Falconer at – ISBN – ISBN – ACRIBIA – – Softcover. DownloadIntroduccion a la genetica cuantitativa falconer pdf. PDF 5. Quarantine 13A 57EF exe C WINDOWS Temp NavBrowser. Introduccion a. Introduccion a La Genetica Cuantitativa Falconer PDFThis action might not be possible to undo. Are you sure you want to continue?.
|Published (Last):||23 May 2012|
|PDF File Size:||16.79 Mb|
|ePub File Size:||20.15 Mb|
|Price:||Free* [*Free Regsitration Required]|
This genealogical structure is disregarded in the original methodology quoted by Paterniani and Miranda Filhobased on two assumptions.
PLANES DE ESTUDIO
With large h 2 the phenotypic value is a good predictor of the genetic value. On the other hand, it can be seen that the BLP was influenced by extreme phenotypic values, because it distributes this influence equally to all the progenies of the same family. Using the best linear predictor BLP in the selection between and among half-sib progenies of the CMS maize population. Figure 1 – Field scheme for half-sib progeny HSP recombination with simultaneous obtention of new progenies.
Email introdkccion subscribed successfully.
An inverse relation of Thus, the gain of selection GS obtained with the BLP is the selection differential SD among the means of the genetic values of the gennetica progenies in relation to all the assessed ones.
In this method, the genetic gains were identical to those obtained based on the BLP, showing its efficiency in isolating the falconerr component, responsible for the heritability and the expected gain, from the phenotypic variance.
In these results, it was shown that the original SAWHSP, quoted by Paterniani and Miranda Filhois an efficient method, even when the relationship of the selected progenies is not considered. The SAWHSP methodology was efficient in isolating the additive genetic variance component from the phenotypic component. A activation email has been sent to you. Send correspondence to C. This difference was attributed to the genotype x environmental interaction, whose component was large in the three cycles, being larger than the estimate of genetic variance among the HSP in this cycle Table I.
Subscribe to our newsletter Some error text Name. However, the indication of a reduction in the effective size of the population caused by an imbalance in the contribution of the genetkca progenies, as shown by the pedigree structure, draws attention to the problem of an increase in the level of inbreeding. Table I shows the individual and joint variance analyses for the four environments, where the importance of the genotype x environment interaction is apparent.
Besides breeding strategies, there are also biometric methodologies with a strong theoretical base which could be used by plant breeders to efficiently identify superior genotypes and obtain greater gains.
Douglas Scott Falconer – Alchetron, The Free Social Encyclopedia
Among 20 progenies gehetica for their phenotypic value in experiments, andthe following old progenies contribution were quantified: A negative correlation of These kinship coefficients were estimated for half-sib progenies, with remnant seeds, based on the following expressions: Table IV also shows that the BLP selected a greater number of progenies stemming from the same ancestor, totaling 11 different maternal half-grandmothers.
In both cases you should know how to switch cookies back on! John Wiley and Sons, New York, pp. The environment variation coefficients are within the variation limits found by Ramalho for this type of progeny.
The joint analysis of the four environments was used to select the 20 HSP which introducfion recombined in the summer of 93 to produce, simultaneously, new progenies to start the fifth cycle of SAWHSP in the CMS population. Success in genetic breeding is mainly dependent on the selection method used. If you have persistent cookies enabled as well, then we will be able to remember you across browser restarts and computer reboots.
When the expiry date is reached your computer deletes the cookie.
This may result in a reduction in the effective size of the population in the more advanced selection generations and consequently in an increase in inbreeding. This fact was observed with the HSP numbered in experimentthe adjusted mean of which, far superior to the others, contributed to the selection of other HSP of the family, even when they had lower phenotypic values than other discarded HSP.
Cookies are little nuggets of information that web servers store on your computer to make it easier for them to keep track of your browsing session. The pedigree system, although unnecessary for the routine use of the SAWHSP methodology, allowed the prediction of an increase in the inbreeding of the population in the long term SAWHSP selection when recombination is simultaneous to creation of new progenies.
Table II – Twenty half-sib progenies HSP selected on the basis of phenotypic value, in decreasing order averages adjusted for corn ear weight. The pedigree system, although unnecessary for HSP selection, allowed the prediction of an increase in the rate of ka in the long term with the originally proposed scheme, when recombination is simultaneously carried out with the creation of new progenies.
Transient cookies are kept in RAM and are deleted either when you close all your browser windows, or when you reboot your computer. The correction of the progeny phenotypic values in function of the design was carried out by adjusting the lattice means.
Selection index and expected genetic advance. Expected and realized gains in the CMS maize population after three cycles of half-sib family selection. It also contributed less faldoner the reduction in the effective size of the population, and consequently reduced future problems with inbreeding.
In other words, the BLP conferred greater importance to the mean of the related progenies with the same half-grandmother than to the means of the cuzntitativa HSP, a process that results in the screening out of the high mean progenies descending from low mean families, which would be selected itroduccion on their phenotype. Introduccion a la Genetica Cuantitativa. This doesn’t mean that anyone who uses your computer can access your account information as we separate association what the cookie provides from authentication.
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.
Although longer and more detailed studies are necessary on the importance of the pedigree in the SAWHSP, the results from the present study showed that the use of this type of relationship in the routine assessment of maize half-sibs may be disregarded. There are several examples in the literature which show gains cuantitatlva truncated selection for yield in various maize populations.
First, the relationship of half-grandparents between the new HSP new cycle and the old HSP previous cycle is irrelevant. These kinship coefficients were estimated for half-sib progenies, with remnant seeds, based on the following expressions:.
The literature has often presented different results among the expected gains and the observed gains from selection. For example, in the experiment Table II the old progeny number 34 contributed four new progenies, when it was expected to contribute only one.
According to Hendersonthe BLUP of g is defined as the regression coefficient of the genetic values g in function of the ckantitativa y corrected for the fixed effects Xb. In the majority of cases the expected gains are overestimated, which was also shown for this cuanntitativa by Arriel et al.
All mainstream modern browsers have cookies enabled by default, so if you’ve been directed to this page it probably means you’re uisng a weird and wonderful browser of your own choosing, or have disabled cookies yourself. Sometimes, we also use a cookie to keep track of your trolley contents. However, the estimates of gain obtained by the BLP were fairly similar to those obtained based on the phenotypic values, showing that the genetic values seem to be under the same influences mentioned by Arriel et al.
Thus, the diagonal of the kinship sub-matrices is 0.
The SAWHSP method was shown to be efficient in the isolation of the additive genetic variance component from the phenotypic variance.