A twin zygosity DNA test determines if twins are identical or fraternal.

This DNA test is based on whether or not the two twins have identical DNA profiles. Identical twins will have the same DNA profiles, as they prenatally developed from the same zygote during gestation. Fraternal twins will have similar, but not identical, DNA profiles, having developed in two separate zygotes during gestation. Fraternal twins’ DNA profiles will be as similar as two non-twin siblings.

Further advice regarding our twin zygosity DNA test, paternity testing, and other DNA testing services please contact our client services team on 0808 234 7027 or complete the feedback form below and we will contact you.

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