"However, an ultrasound at 14 weeks showed the twins ... Non-identical, or dizygotic, twins occur when two separate eggs are fertilised, each by a different sperm, and develop in the womb at ...

An X-ray, CT scan, MRI, or ultrasound assessment ... or dissimilar enough to be dizygotic. Observing physical features is really the main way to determine if twins are mirror twins.

Linkage in 181 dizygotic twin pairs yielded a 6.93 lod score. The PPARG C→T substitution allele was far less common in monozygotic twins than in dizygotic twins. Dizygotic heterozygosity was ...

The research surveyed more than 1,500 parents of monozygotic and dizygotic twins aged 3 to 9. It found that when one twin was typically developing and the other had a developmental condition ...