Why do fraternal twins sometimes look identical?

Fraternal twins and siblings can look very similar to each other and since all twins are the same age, then can look very, very similar. read more

Fraternal twins and siblings can look very similar to each other and since all twins are the same age, then can look very, very similar. But dizygotic twins can never be quite as identical as monozygotic twins because they come from two separate eggs just like regular siblings and don’t share the same DNA like identical twins. read more

While identical twins form with the same set of genes, human development is not just genetic. The environment also has an impact. So, beginning in the early environment of the womb, external influences can change the appearance of twins. read more

Fraternal twins are the result of two eggs being fertilized by two sperm. The zygotes implant separately, meaning each baby ends up developing their own sac and placenta. Fraternal twins can be boy/boy, boy/girl, or girl/girl. Identical twins are the result of one fertilized egg splitting. read more