A Monozygote refers to an Identical Twin. It is one of the two identical organisms developed from a single egg that has split. In the rare instance that more than two are formed from the one egg, then each of them from that egg would be a monozygote (e.g., identical triplets). Monomeans one, or single Zygote refers to the organism(s) that develop from the cell that forms as soon as an egg is fertilized.
Co-dominance.
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.
It means "from a different egg". It is generally used to describe non-identical twins who formed embryos from 2 or more different egg cells. Identical twins are called monozygote as they separated from the same fertilized egg cell.