The team say the boy and girl, now four years old, are the second case of semiidentical twins ever recorded, and the first to be spotted while the mother was pregnant The situation was a surprise to the researchers An ultrasound of the 28year old mother at six weeks suggested the twins were identical – with signs including a shared placenta As a result, the chances of fraternal twins resulting in boys, girls, or a combination are the same as for any other pair of siblings Monozygotic twins, on the other hand, are always the same gender, either two girls or two boys Fraternal Twins (Dizygotic) Come from their own egg and sperm Share about 50% of DNA Twins of different genders are universally accepted as a sound basis for a clinical determination that boy and girl twins are not identical However, in extremely rare cases, boy and girl twins can stem from the same fertilized egg Twins, who stem from the same fertilized egg, are called monozygotic twins
Twin Pregnancy Types Fraternal Identical
