Which type of twins is more common: paternal (identical) or fraternal (dizygotic)? I think it’s fraternal, but I want to be sure…
http://www.nomotc.org/twins.htm#ratio
RATIO OF IDENTICAL VS. FRATERNAL TWINS
In the United States approximate ratios are the following:*
One third of all twins are identical with an equal distribution of male/male and female/female pairs
(NOTE: Recent figures have indicated a slight increase of identical twins over fraternal twins.)
One third are same sex fraternal twins
One third are boy/girl twins