Considerazioni genetiche sullo sviluppo osseo in gemelli MZ e DZ

Abstract

SUMMARYRoentgenograms have been taken of the hand and wrist on 58 pairs of MZ twins, on 40 pairs of DZ twins, and on 4 groups of triplets, between 2 and 18 years of age.Their comparative examination has shown the highest concordance in MZ pairs and a remarkable discordance in DZ pairs, accentuated above all in those of opposed sex. Generally, the comparison between male and female pairs of same age has shown a delay on bony growth of the firsts, event remarkable also within DZ pairs of opposed sex.Comparing the Roentgenograms taken with those standard of Greulich and Pyle, generally it is to be remarked that males are retarded in regard to females.Some cases of concordant paramorphysms in healthy pairs of MZ twins and of remarkable immaturity in MZ pairs at the same time sick are also shown.