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Beckman, L., J.A. Böök, and E. Lander. 1960. An evaluation of some anthropological traits used in paternity tests. Hereditas 46: 543-569.
Charles Sturt University. "Biology." HSC Online. Neals, 2013. Web. 19 Jan. 2014.
Glass, B., and J.C. Kistler. 1953. Distal hyperextensibility of the thumb. Acta Genetica 4: 192-206.
Howard Hughs Medical Institute. "Observable Human Characteristics." Observable Human Characteristics. University of Utah, 2013. Web. 19 Jan. 2014.
Jones, Kristin. "Genetics Unit." Biology Class. Novi High School, Novi. 8 Dec. 2010. Lecture.
Komai, T. 1951. Notes on lingual gymnastics. Frequency of tongue rollers and pedigrees of tied tongues in Japan. Journal of Heredity 42: 293-297.
Lai, L.Y.C., and R.J. Walsh. 1966. Observations on ear lobe types. Acta Genetica 16: 250-257.
Lebow, M.R., and P.B. Sawin. 1941. Inheritance of human facial features: a pedigree study involving length of face, prominent ears and chin cleft. Journal of Heredity 32: 127-132.
Martin, N. G. 1975. No evidence for a genetic basis of tongue rolling or hand clasping. Journal of Heredity 66: 179-180.
Matlock, P. 1952. Identical twins discordant in tongue-rolling. Journal of Heredity 43: 24.
McDonald, John H. "Myths of Human Genetics." : Cleft Chin. University of Delaware, 29 Oct. 2012. Web. 18 Jan. 2014.
Powell, E.F., and D.D. Whitney. 1937. Ear lobe inheritance: an unusual three-generation photographic pedigree chart. Journal of Heredity 28: 184-186.
Wiener, A.S. 1937. Complications in ear genetics. Journal of Heredity 28: 425-426.
Charles Sturt University. "Biology." HSC Online. Neals, 2013. Web. 19 Jan. 2014.
Glass, B., and J.C. Kistler. 1953. Distal hyperextensibility of the thumb. Acta Genetica 4: 192-206.
Howard Hughs Medical Institute. "Observable Human Characteristics." Observable Human Characteristics. University of Utah, 2013. Web. 19 Jan. 2014.
Jones, Kristin. "Genetics Unit." Biology Class. Novi High School, Novi. 8 Dec. 2010. Lecture.
Komai, T. 1951. Notes on lingual gymnastics. Frequency of tongue rollers and pedigrees of tied tongues in Japan. Journal of Heredity 42: 293-297.
Lai, L.Y.C., and R.J. Walsh. 1966. Observations on ear lobe types. Acta Genetica 16: 250-257.
Lebow, M.R., and P.B. Sawin. 1941. Inheritance of human facial features: a pedigree study involving length of face, prominent ears and chin cleft. Journal of Heredity 32: 127-132.
Martin, N. G. 1975. No evidence for a genetic basis of tongue rolling or hand clasping. Journal of Heredity 66: 179-180.
Matlock, P. 1952. Identical twins discordant in tongue-rolling. Journal of Heredity 43: 24.
McDonald, John H. "Myths of Human Genetics." : Cleft Chin. University of Delaware, 29 Oct. 2012. Web. 18 Jan. 2014.
Powell, E.F., and D.D. Whitney. 1937. Ear lobe inheritance: an unusual three-generation photographic pedigree chart. Journal of Heredity 28: 184-186.
Wiener, A.S. 1937. Complications in ear genetics. Journal of Heredity 28: 425-426.