Effect of overall phenotypic selection on genetic change at individual loci.

Effect of overall phenotypic selection on genetic change at individual loci.

The selective advantage of an allele Gi (relative to the mean of alleles at this locus) is given by (formula: see text) in which Ai is the average excess of the allele on the character, X; W(X) is the fitness function; F(X) is the frequency function; W is the mean fitness; and the prime denotes differentiation. With truncation selection si = AaF(C)/w in which F(C) is the ordinate at the culling...

effect of oral presentation on development of l2 learners grammar

this experimental study has been conducted to test the effect of oral presentation on the development of l2 learners grammar. but this oral presentation is not merely a deductive instruction of grammatical points, in this presentation two hypotheses of krashen (input and low filter hypotheses), stevicks viewpoints on grammar explanation and correction and widdowsons opinion on limited use of l1...

Reciprocal recurrent selection effects on the genetic structure of tropical maize populations assessed at microsatellite loci

A modified reciprocal recurrent selection (RRS) method, which employed one cycle of high-intensity selection, was applied to two tropical maize (Zea mays L.) populations, BR-105 and BR-106, originating the improved synthetics IG-3 and IG-4, respectively. In the present study the effects of this kind of selection on the genetic structure of these populations and their synthetics were investigate...

Selection and Genetic Change

the effect of explicit teaching of metacognitive vocabulary learning strategies on recall and retention of idioms

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