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By means of roentgenographic cephalometry and quantitative genetic analysis, the relative contribution of the genetic and environmental components to the ontogenic change of the ventrodorsal view of the craniofacial complex was shown to vary with age. The genetic component of variance significantly increased until the 80th day. Inversely, the maternal component of variance showed a large value during the early stage of postnatal growth and gradually decreased thereafter to a very small amount by the 80th day. In general, it appeared that the genetic effect became larger with the age of the rat and the maternal effects tended to diminish. The environmental component of variance did not change much over the course of the experiment. We thus concluded that the genetic effect contributed to the change of the ontogenic variation of the craniofacial complex through all experimental periods and the maternal effect contributed to the change at the early growth stage of the craniofacial complex.
K Nonaka, and
M Nakata
March 1967,
Revue de neuropsychiatrie infantile et d'hygiene mentale de l'enfance,
K Nonaka, and
M Nakata
December 2002,
American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics,
K Nonaka, and
M Nakata
May 2021,
Anatomical record (Hoboken, N.J. : 2007),
K Nonaka, and
M Nakata
October 1972,
Acta morphologica Neerlando-Scandinavica,
K Nonaka, and
M Nakata
February 1978,
Acta ophthalmologica,
K Nonaka, and
M Nakata
December 1994,
Acta stomatologica Belgica,
K Nonaka, and
M Nakata
March 2003,
Congenital anomalies,
K Nonaka, and
M Nakata
January 1991,
Stomatoloski glasnik Srbije,
K Nonaka, and
M Nakata
February 2007,
Theoretical population biology,
