Ferternal twins don't look alike, but twins do
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If two (or more) eggs are fertilised and develop together you will get fraternal twins. Identical twins are the result of a single fertilised egg dividing into two embryos.
Identical twins come from one egg and one sperm. Fraternal twins come from two eggs and two sperm.
Fraternal twins are more popular.
Another name for fraternal twins is dizygotic twins.
Fraternal twins can be the same sex or opposite sexes. It doesn't matter.