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Modern Genetic Analysis Chapter 18. Quantitative Genetics
Solved Problem

2. | Two inbred lines of beans are intercrossed. In the F1, the variance in bean weight is measured at 1.5. The F1 is selfed; in the F2, the variance in bean weight is 6.1. Estimate the broad heritability of bean weight in the F2 population of this experiment. See answer

Solution

The key here is to recognize that all the variance in the F1 population must be environmental because all individuals must be of identical genotype. Furthermore, the F2 variance must be a combination of environmental and genetic components, because all the genes that are heterozygous in the F1 will segregate in the F2 to give an array of different genotypes that relate to bean weight. Hence, we can estimate

Therefore

and broad heritability is

See question

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