Summary
Three methods of estimation of heritability and genetic correlation between traits in the F2 and F3 generations of self-fertilizing species were compared. The methods were:
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1.
Subtracting the estimates of environmental variances and covariances from the corresponding phenotypic estimates in the segregating generation which yields ‘broad-sense’ heritability and genetic correlation.
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2.
Analyses of variance and covariance of full-sib families; correlations were calculated from the between-families components and heritability was estimated by using intraclass correlation.
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3.
Offspring on parent regression for single traits and pairs of traits which yields estimates of heritability and genetic correlation.
Theoretically, the family-analysis method is superior to the two others, because those estimates are less affected by non-additive genetic variance and covariance. Actual estimates for six traits in peanuts and their 15 two-trait combinations were calculated only for the purpose of comparison between the three methods. These estimates seem to be in agreement with conclusions which were drawn from the theoretical considerations.
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Literature
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Communicated by R.W. Allard
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Cahaner, A., Hillel, J. Estimating heritability and genetic correlation between traits from generations F2 and F3 of self-fertilizing species: a comparison of three methods. Theoret. Appl. Genetics 58, 33–38 (1980). https://doi.org/10.1007/BF00264666
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DOI: https://doi.org/10.1007/BF00264666