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John and Edward Grimes are monozygotic -- identical twins -- hence they physically appear to be the same. Monozygotic twinning occurs when a single egg isfertilisedto form one zygote but subsequently splits the progenitor cells (fundamental genetic material) into two halves, each of which then becomes a separate embryo. Dizygotic (non-identical) twinning occurs when two separate eggs are fertalised. In multiple births of three or more, there may be a combination of the two.

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12y ago

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