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Estimate of chromosomal heritability from a joint analysis of all 22 autosomes (labeled on graph) as a function of the genetic length of the chromosome. The figure shows that there is a relationship between the genetic length of a chromosome and the amount of variance it explains. P<.0001 for the regression coefficient from a weighted least-squares analysis if no intercept is fitted. P=.683 if an intercept is fitted after the regression.
