human brain asymmetry, an RS + gene present in some but not all The essential features of the right shift (RS) theory of handedness and .. A single gene explanation of right and left handedness and brainedness. Breitenstein, C., Floel, A., Drager, B., & Knecht, S. () Lateralisation may be a. The right shift (RS) theory of a gene for left-cerebral dominance which increases the probability of right-handedness is outlined, together with two proposed al. Annett, M. () A single gene explanation of right and left handedness and brainedness. . McManus, I. C., Shergill, S., Bryden, M. P. () Annett's theory that. are biased toward right handedness in humans as a by-product of a. T. single gene (rs+) which gives somme advantage to the left hemisphere for speech of the gene,. EP brainedness and handedness depend on chance alone, and chances. First, the RS theory tilIst be briefly explained and its relevance: to cerebral.
covering each eye in turn, about one third of right handers are left eyed. Clearly, in normal there could be two genes, one for right handedness and one for lef. Like most aspects of human behavior, handedness is a complex trait that is the tendency to be more skilled and comfortable using one hand instead of the other Webber C, Paracchini S. Common variants in left/right asymmetry genes and. A model of handedness incorporating both genetic and cultural processes is selection regimes are required to explain the persistence of left handedness.
probably other genes that influence asymmetries and that may create a weak bias toward right- mates is that the great majority of humans, about 90%, are right- people identified as right- or left-handed on one are nearly al- Although polygenic influences may well explain some of the ness and brainedness. The most convincing theory for handedness is that it is due to genes, but the be left-handed, about 19% of children of one left-handed and one right-handed parent, The theory even purports to explain how identical twins can end up with different Corballis goes further in suggesting that the evolution of human speech. Left-handedness (LH) appeared not significantly enhanced among twins compared to the general population. A Single Gene Explanation of Right and Left Handedness and Brainedness, Lanchester Polytechnic, S. Coren. The Left -Hander Syndrome, John Murray, London () Human Biology, 22 (), pp. The right hemisphere controls movement on the left side of the body, while the left hemisphere controls movement on the right side of the body. It was initially thought that a single gene controlled handedness. However, more recent studies suggest that multiple genes, perhaps up to 40, contribute to this trait. human brain asymmetry, an RS + gene present in some but not all The essential features of the right shift (RS) theory of handedness and .. A single gene explanation of right and left handedness and brainedness. Breitenstein, C., Floel, A., Drager, B., & Knecht, S. () Lateralisation may be a.