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  • Pair of young identical twin boys leaning on a wall.
    Rights: Image licensed through Published 28 June 2011 Size: 62 KB Referencing Hub media

    Identical or monozygotic twins occur when a single egg is fertilised to form 1 zygote that divides into 2 separate embryos. As a result, identical twins share identical DNA but may show differences in their phenotype due to environmental factors.

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