A survey of genetics students examined the heritability of h

A survey of genetics students examined the heritability of human height.  It can be shown that, under certain conditions, the  slope (b) of the regression of a person’s height on the height of their same-sex parent can be used as an estimate of half of the narrow-sense heritability (i.e. h2 = 2b).The data are plotted above. Results of the analysis were as follows:Combined male and female data, with adjustment for sex (number of samples = 94): b = 0.38 (p-value < 0.0001).1. Using the combined data from males and females, the estimate of narrow-sense heritability would be?2. The statistical test of the regression slope evaluates how likely it is that we would have obtained a slope this large if the true heritability were zero.  The usual p-value threshold for a statistical test is 0.05.  Thus, what is the correct interpretation of the p-value of less than 0.0001 in the combined analysis?