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Identical sex twinBut, as explained here , identical twins do not always look exactly the same. Using that definition, the answer is yes! Humans have 23 pairs of chromosome. One of these pairs of chromosomes, called the sex chromosomes X and Y , determine the sex of the person. Very rarely, a glitch in copying sex chromosomes can occur, either during the formation of sperm or egg cells, or during the divisions of the zygote after it is formed. The result can be a MZ twin pair of opposite sexes.In order to deduce zygosity, we must recall that all mixed-sex twin sets are by definition fraternal. And given the proportions of identical twins and fraternal twins . Many think that being identical twins refers to how twins look and not how they form. Take a look at the biology that determines the sex. If you've been on the Internet at all in the last few years, you've probably heard of the 'world's most identical twins', Anna and Lucy DeCinque...the end of the story look at the video above ↑ ↑ ↑

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