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are two genetically unique individuals as they come from two separate eggs that are fertilized by separate sperm. The resulting egg/sperm combination can be male or female. The result is either two male.

This occurs when a woman releases multiple eggs and has sexual relations with more than one partner. If an egg is fertilized by sperm from one.

If twins are a boy and a girl, clearly they are fraternal twins, as they do not have the same DNA. A boy has XY chromosomes and a girl has XX.

Fraternal twins may be the same gender, they may have many of the same characteristics, but also may be very different from each other and, in fact, share half of. This differs from fraternal twins, where two eggs (ova) are fertilised by two sperm women in their 30s and 40s have higher levels of the sex hormone oestrogen.