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Chronological Development of Bones and Teeth A twin study *

Published online by Cambridge University Press:  01 August 2014

L. Gedda  and
G. Brenci
L. Gedda*
Affiliation:
The Gregor Mendel Institute of Medical Genetics, and Twin Research, Rome
G. Brenci
Affiliation:
The Gregor Mendel Institute of Medical Genetics, and Twin Research, Rome
*
Istituto di Genetica Medica e Gemellologia Gregorio Mendel, 'Piazza Galeno 5, 00161 Roma, Italy

Extract

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The hereditary component of the chronological development of bones and teeth has been studied, in 40 twin pairs aged 5-7 years, through dental age (defined on account of the mineralization of the permanent dentition's dental buds) and bone age (denned on account of the presence and form of the hand ossification nuclei).

The statistical analysis shows a correlation coefficient of 0.95 in MZ and 0.84 in DZ twins for dental age; and of 0.94 in MZ and 0.81 in DZ twins for bone age.

The following are therefore the estimates of the hereditary component (based on Holzinger's formula) for the two parameters studied:

Type
Session 6 - Twin Studies in Growth and Senescence
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 19 , Issue 1-2 , April 1970 , pp. 75
Copyright
Copyright © The International Society for Twin Studies 1970

Footnotes

*

For the complete study, cf. II. 1, in:

L. Gedda, G. Brenci (1969). Biology of the gene: the ergon/chronon system. Acta Genet. Med. Gemellol., 18: 329-379.

References

* For the complete study, cf. II. 1, in:

L. Gedda, G. Brenci (1969). Biology of the gene: the ergon/chronon system. Acta Genet. Med. Gemellol., 18: 329-379.