1.WHY TWINS ARE BORN? Identical or monozygotic twins are formed when one egg is fertilized by one sperm which then divides into two separate embryos. Each shares exactly the same genetic components and identical genetic structures. … Non-identical or dizygotic twins form from two separate eggs being fertilised by two separate sperm. 2.What twins are hereditary? Having identical twins is not genetic . On the other hand, fraternal twins can run in families. Genetics can definitely play a role in having fraternal twins . For example, a woman that has a sibling that is a fraternal twin is 2.5 times more likely to have twins than average! 3.When twin baby born? Lots of women think they have to have a caesarean section with twins . In fact, more than 40% of all twins are born vaginally and the process is similar to that of a single baby . If you’re planning a vaginal delivery, it’s usually recommended that you have an epidural for pain relief. 4.Who twins born