Identical Twins, Product of fertilisation of one ovum and one sperm to form one zygote., Embryo divides into two., Genetic makeup & physical appearances are similar., The sex of both twins is the same., Fraternal Twins, Product of fertilisation of two ova and two sperms to form two zygotes., Embryo does not divides into two., Genetic makeup & physical appearances are different., The sex of both twins may be the same or different.

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