There is a common misconception that twins only come down through the mother’s side. It is true only when the father is the one with twins in the family or is a twin himself and moreover, he is also the one trying to conceive twins. It means that the man only provides the sperm; whereas, the woman is the one who either ovulate two or one egg that splits. That is why woman can inherit the hyper-ovulation gene from an aunt or grandmother on the father’s side. But in the same time father would not have any chance of having twins himself when he had his children/ child.
There are basically five common variations of twinning. The most common type of twinning is fraternal, male-female twins. This particular combination makes up approximately 40 percent of all twins born, followed by fraternal girls, then fraternal boys. After that, there's identical girls, then identical boys. The latter being the least common type of twinning of the five mentioned here.
So what is the difference between identical and fraternal twins?
Identical twins are produced when a single fertilized egg by some quirk of nature divides into two embryos that develop within the same sac. Whereas fraternal twins are two separate eggs that are fertilized and implant into the womb at the same time. It is can be because the mother naturally produces more than one egg she ovulates.
Identical twins share the same cellular and genetic make up and many people believe that their DNA’s are identical. For its part fraternal twins have their own individual cellular and genetic make up, develop in separate sacs and each baby has its own unique DNA. In reality they are not twins at all, they’re just sisters or brothers that have born on the same day.