broad-sense heritability


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Related to broad-sense heritability: selection differential

broad-sense heritability

[¦brȯd ‚sens ‚her·ə·tə′bil·ə·dē]
(genetics)
The degree to which individual phenotypes are determined by their genotypes; expressed as the ratio of the total genetic variance to the total phenotypic variance.
References in periodicals archive ?
[38] found low to high broad-sense heritability values ranging from 4.75% to 92.6% depending on the trait and the cross.
The selection of recombinants with high iron concentrations in seeds is promising in this cross due to the high broad-sense heritability estimates ([h.sup.2]b= 67.83%) and predicted gain with selection ([DELTA]G%= 24.43%) and due to the intermediate narrow-sense heritability ([h.sup.2]n= 45.29%).
Estimates of the broad-sense heritability from the intraclass correlations differed almost by a factor of two between third-instar larvae and adults (0.49 to 0.25), but the large standard errors typical of these analyses prevented meaningful tests of significance between estimates.
For the [F.sub.2] population, the broad-sense heritability estimates ranged from low (Caiaponia x IAC-100) to moderately high (Luziania x Potenza) (Table 4).
Broad-sense heritability values calculated using the following formula:
The random nongenetic effects had a normal distribution with a mean of zero and were scaled so that broad-sense heritability among testcrosses was H = 0.20, 0.50, or 0.80 in the initial [F.sub.2] population.
Accurately finding the broad-sense heritability of a trait in natural populations, where the organisms in question are not deliberately sorted into particular environments, is quite difficult; in the case of humans, it is all but impossible.
The clonal heritability was estimated as the broad-sense heritability: genotypic variance divided by the total environmental or phenotypic variance (Falconer 1985; Via 1991).
The estimate of the broad-sense heritability ([h.sup.2.sub.a]) for each month (t) of egg production was calculated as follows: [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] where [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is the genotypic variance in the month [t.sub.i].
The broad-sense heritability and the narrow-sense heritability were estimated with the backcross method (WARNER, 1952), by the following expressions:
Broad-sense heritability estimates were 0.46 on a plot basis at Ames, 0.37 on a plot basis at Portageville, and 0.82 on an entry-mean basis.