Recollections of a Confederate Staff Officer (review)

Lerner, Arthur

doi:10.1353/cwh.1958.0044

Cited by 4 publications

(4 citation statements)

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“…The nature of the genetic correlation is therefore poorly understood. Theoretical evidence suggests that changes in gene frequency have more effect on genetic covariances than they do on genetic variances (BOHREN, HILL and ROB-ERTSON 1966), that a transient genetic correlation may be due to linkage disequilibrium rather than pleiotropy (COCKERHAM 1956) and that the genetic covariance may change sign as a consequence of selection (LERNER 1958) genetic improvement of plants and animals, the genetic correlation is of interest in paleontological studies of evolution (HALDANE 1955). In addition, it is the genetic correlation of a quantitative character with fitness that determines the genetic properties of that character in a natural population.…”

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confidence: 99%

An Experimental Evaluation of Genetic Correlation

1973

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Heritability and genetic correlations realized from both single-trait and antagonistic index selection were compared with paternal half-sib estimates. Primary attention was focused on the genetic correlation between six-week body weight and six-week tail length. Parameters realized from single-trait selection were in excellent agreement with paternal half-sib estimates. However, the realized genetic correlation between six-week body weight and six-week tail length obtained from index selection was significantly greater than the other estimates. Differential inbreeding levels and realized selection intensities were considered and rejected as being causative factors for these results. Linkage disequilibrium probably was not a factor either, as the base population had been randomly mated and randomly selected with a large effective population size for many generations. It was concluded that with antagonistic index selection, the pleiotropic effects of genes may be more powerful in retarding response in aggregate genotype than current theory would suggest. Replication of all selected and control lines allowed the use of between-line estimators of sampling variances of realized genetic parameters in the above comparisons. Generally, standard errors of realized genetic parameters were much smaller than corresponding paternal half-sib standard errors. Thus, selection was an efficient method of estimation.

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confidence: 99%

An Experimental Evaluation of Genetic Correlation

1973

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“…On the other hand, the results of a long-time selection experiment at the University of California (LERNER 1958) did not indicate that a plateau had been reached in a White Leghorn strain selected on an intra-population basis. Continuous selection was made for egg production, viability and other traits over a 24year period.…”

Section: Discussionmentioning

confidence: 90%

Regression in Egg Production in the Domestic Fowl When Selection Is Relaxed

Nordskog

Giesbrecht

1964

Genetics

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“…I t made use of a base population of Single Comb White Leghorn chickens (the so-called Production Line, P) which had been under selection for high egg production since 1932. Its selection history, including many results, has been given by LERNER (1958). In the first 20 years of its existence (about 12 generations) this population had almost doubled its egg production to about 75 weeks of age, the trait primarily selected.…”

Section: Methodsmentioning

confidence: 99%