The most common gender combination for twins is boy-girl.
While it's tempting to assume that twins are always the same gender, this is not the case. In fact, boy-girl twins are more common than twins of the same gender. This is because fraternal twins, which develop from two separate eggs fertilized by two separate sperm, are more common than identical twins.
Here's a breakdown of the common twin types and their gender possibilities:
- Fraternal Twins: These twins develop from two separate eggs and are genetically distinct. They can be either boy-girl, boy-boy, or girl-girl.
- Identical Twins: These twins develop from a single fertilized egg that splits into two embryos. They are genetically identical and will always be the same gender.
Since fraternal twins are more common, boy-girl combinations are the most frequent. However, it's important to note that the probability of having boy-girl twins is not exactly 50%.
