Identical twins are born when an embrio consisting of only one or two cell undergoes fission to form two seperate embrios to develop into a set of equal twins Galton (1875) states that [identical] twins are the results of a single ovum with two "germinal spots."
Verschuer, surrounded by his 1939 presentation to the London Royal Society, presented zygotic division during the implantation phase as a new proposition.
Boomsma's recent article in Nature reviews historic twin studies.
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