Large fluctuations were expected for dizygotic twin pregnancies, because the informative SNP loci would consist of 2 categories, loci in which both fetuses were heterozygous (1) and loci in which only one of the twins was heterozygous (2) (Fig.
Annett, (1994), found that the preferential use of left upper limb is significantly more pronounced in twins subjects (almost in the same proportion in monozygotic twin pairs and dizygotic twin pairs) (I.
Data Source: A population-based twin study involving 54 monozygotic and 138 dizygotic twin pairs born in 1987-2004 in which at least one of the twins met the diagnostic criteria for autism or autism spectrum disorder.
With time it became clear that this second sculpture court was in fact laid out as a mirror image of the first; each sculpture in the first room had a dizygotic twin in the second that had been placed in a bilaterally symmetrical relation to the implied seam bisecting the gallery.
While both genetics and environment have a role to play in the relationship between height and cognition, environmental factors appear to be responsible for two-thirds of the height-intelligence correlation, according to research conducted on cross-trait (height and intelligence), cross-twin correlations between monozygotic and dizygotic twin pairs.