Summary
The univariate method of predicting the properties of the inbred lines produced by single seed descent for single or pairs of independent characters is extended to predict their properties for two or more characters simultaneously irrespective of their interrelationships. The bivariate and trivariate predictions for two and three characters segregating simultaneously require only one parameter, the additive genetic correlation between pairs of characters, in addition to those required for the univariate case. Satisfactory estimates of all the parameters can be obtained early in the inbreeding programme for an F2 triple test-cross.
The procedures for making bivariate and trivariate predictions are illustrated using parameters estimated from an inbred triple test-cross and for one pair of characters from an F2 triple test-cross, all the material being derived from a cross between varieties 1 and 5 of Nicotiana rustica. The predictions are compared with the properties of a random sample of 80 F11 families derived by single seed descent from the same cross.
Although there appears to be a good overall agreement between the predicted and observed properties of the F11 families, a statistical test of the accuracy of the predictions must await larger sample sizes than the 80 families currently available.
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Pooni, H., Jinks, J. Predicting the properties of recombinant inbred lines derived by single seed descent for two or more characters simultaneously. Heredity 40, 349–361 (1978). https://doi.org/10.1038/hdy.1978.42
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DOI: https://doi.org/10.1038/hdy.1978.42
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