MA Navarrete del Toro

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It has been claimed that in competitive conditions larval viabilities of Drosophila melanogaster depend on the similarity of genotypes coexisting. Two types of experimental populations were established: homogeneous (low genotypic variability) and heterogeneous (high genotypic variability). Under conditions of moderate larval competition productivity was(More)
Artificial divergent selection for the rate of homosexual copulation (defined as the proportion of homosexual mountings performed by a male in a period of 30 min) has been carried out for 2-3 generations in a population of Tribolium castaneum. A clear response was obtained in each of 4 replicates, corresponding to an overall realized heritability of 0.11 f(More)
Spontaneous mutations accumulated during 80 generations in 94 lines derived from a completely homozygous population of Drosophila melanogaster, all of them maintained by a single brother-sister mating per generation. Three traits were evaluated: early productivity, late productivity, and longevity. Mutational heritabilities were similar for all traits: 3.18(More)
The use of population genetic variability in present-day selection schemes can be improved to reduce inbreeding rate and inbreeding depression without impairing genetic progress. We performed an experiment with Drosophila melanogaster to test mate selection, an optimizing method that uses linear programming to maximize the selection differential applied(More)
Teat number is a discontinuous and often canalized trait in populations of domestic swine. This is the case in the Iberian pig where 90 p. 100 of individuals show 10 teats. The estimation of genetic parameters for this discrete and strongly leptokurtic trait presents difficulties similar to those encountered in dichotomous ones, and several specific methods(More)
This work provides a comparative study of the inhibitory effect of several plant protein sources on digestive proteases of two snappers: yellow snapper (Lutjanus argentiventris) and dog snapper (Lutjanus novemfasciatus). Seed extracts did not affect gastric proteases whereas they significantly inhibit intestinal proteases. Inhibition of alkaline proteases(More)
The study of the relationship between genetic homogenity and intensity of competition in groups of organisms may help to explain the widespread existence of sexual reproduction and it can also be used to design efficient crop mixtures. To study this, we compared the survival of sib groups and random groups of larvae of the beetle Triboliunre castaneum(More)
A new method that allows use of part of the dominance effects in a closed population is proposed. In the framework of a progeny test selection scheme, the method basically consists of performing 2 types of matings: a) minimum coancestry matings in order to obtain the progenies that will constitute the commercial population and that will also be utilized for(More)
The use of prior information in the estimation of the heritability by parent-offspring regression is discussed within a bayesian context. The a posteriori distribution is obtained by combining the a priori distribution (uniform between 0 and 1), to that obtained from the data. Hence, a bayesian estimator h*2 is proposed and its performance compared with(More)
Over the long course of evolution and under the selective pressure exerted by pathogens and parasites, animals have selectively fixed a number of defense mechanisms against the constant attack of intruders. The immune response represents a key component to optimize the biological fitness of individuals. Two decades ago, prevention and control of diseases in(More)