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How many families have participated in the GEO project, and how many twins are identical or fraternal?

April 26, 2017Families fraternal Geo identical participated project twins

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How many families have participated in the GEO project, and how many twins are identical or fraternal?

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The sample consists of 784 sets of twins born between 1991 and 2003. Of the 784 twin pairs, 271 pairs are genetically identical, 270 are same-sex fraternal, 231 are boy/girl pairs, and 12 are of undetermined zygosity.