Fraternal twins can look alike as much as two siblings ... another egg by the second man. This is called superfecundation. Mixed-gender twins are the most common type of fraternals, some 50 ...

If Mom releases two eggs in the same menstrual cycle and they're fertilized by sperm at separate times from two different men, it's called superfecundation – which means fraternal twins will be ...

One egg is fertilized by one man, another egg by the second man. This is called superfecundation. The Science of Fraternal Twins Mixed-gender twins are the most common type of fraternals ...