A heritability of 0.40 means that ____ percent of the variation in the trait of interest is explained by ______
Added by Matthew M.
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Heritability is a measure used in genetics that estimates the proportion of variation in a trait that can be attributed to genetic differences among individuals in a population. Show more…
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An adoption study of some behavioral trait is conducted. The correlation coefficient for adopted-apart siblings for this trait is 0.30. If the siblings examined in the study are not maternal twins, what is the approximate heritability of the trait?
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A total of 20 distinct phenotypic categories should be observed for a polygenic trait in humans that results from segregation of additive alleles for genes. Heritability measures the extent to which environmental factors contribute to the total phenotypic variation (VA - VD + VI) VP can be used to calculate broad sense heritability (H2). As broad sense heritability (H2) approaches 0.0, almost all the variation in phenotype is due to genetic factors (VG). If for a specific trait monozygotic twins have a phenotypic variance of 15% and dizygotic twins have a phenotypic variance of 40%, VE for monozygotic twins is 15% and VG for dizygotic twins is 50%. High concordance values for both identical and fraternal twins indicate a likely strong genetic influence for the condition. A low H2 value for a trait could most effectively be selected in an animal breed. Gene-environment interactions widen the potential phenotypic range. While most additive polygenic traits show continuous distribution, threshold traits can be divided into two or more categories based on their contribution to genetic liability.
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If heritability for a trait equals 0.90, is the phenotypic variation mostly due to a. genetic variation, b. environmental variation, or c. something else?
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