<Li> Female - female--sometimes called sororal twins </Li> <Li> Male - male twins--no special name </Li> <Li> Male--female twins--most common pairing; half of all fraternal (dizygotic) twins are male - female </Li> <P> Among non-twin births, male singletons are slightly (about five percent) more common than female singletons . The rates for singletons vary slightly by country . For example, the sex ratio of birth in the US is 1.05 males / female, while it is 1.07 males / female in Italy . However, males are also more susceptible than females to die in utero, and since the death rate in utero is higher for twins, it leads to female twins being more common than male twins . </P>

Can there be fraternal twins of the same gender