Mirror Twins are always monozygote twins.
This does not mean that fraternal twins won't be a righty and a lefty - if your family tends to run left handed.
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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.
Yes, fraternal twins are perfectly normal.
Fraternal twins started from two separate eggs in the mother. By comparison, identical twins started from one egg but it divided at the first stage of development into two separate zygotes (and thus two separate babies).