A genetic study on the length of tibia

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Abstract
The modified data proved to be a normal distribution on skewness and kurtosis test; they were analyzed on a quantatitive genetic basis. No significant contribution of X-linked and Y-linked genes to tibial length was found in an analysis of parent-child combinations. There was no indication of maternal effect, since the difference between father-child (r = 0.36 .+-. 0.05) and mother-child (r = 0.42 .+-. 0.04) correlations was not significant. Correlation coefficients between sibs were significant, the values being 0.57 .+-. 0.09 for brother-brother, 0.32 .+-. 0.22 for sister-sister, and 0.27 .+-. 0.13 for brother-sister. Correlation coefficients between parent and child were also significant, the values being 0.36 .+-. 0.06 for father-son, 0.35 .+-. 0.09 for father-daughter, 0.44 .+-. 0.04 for mother-son, 0.35 .+-. 0.07 for mother-daughter. The regression coefficients of child on midparent were calculated to be 0.77 .+-. 0.12. The heritability of the length of tibia may be estimated to be 0.77 .apprx. 0.80. Contribution of dominance variance to total variance was very small (VD = 0.01), in contrast to a far greater additive genetic variance (VA = 0.80).

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