BR1-08: Twins

The word "Twin" comes from the ancient Greek word twins, which means "two together". There are three kinds of twins identical twins, fratrenal twins and conjoined twins. Identical twins have the same DNA. This means that a pair of identical twins is always a pair of boys or a pair of girls. Identical twins usually look alike. Fraternal twins don't share the same DNA. They may look alike, although many do not. They can be a pair of boys or girls, or a boy and girl. Conjoined twins are identical twins who are joined together at a part of their bodies. Conjoined twins are very rare. I have friends that fraternal twins and identical twins.

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Reference

Allan, T. (2007). Twins. Australia: Nelson Australia Pty Ltd.