Optional participant:  One or both alleged or known parent(s) of the 2 Alleged Twins 

Probability of Zygosity will indicate either:  <0% or >99%

EXCLUSION = <0%  (There is a 0% chance that they are identical twins)  

INCLUSION = >99% (There is a >99% chance that they are identical twins)   

If the profiles of the twins tested are different, then it is determined that the tested twins are fraternal.  Otherwise, if their DNA is identical, then a probability of being identical is computed.

* A free DNA self-collection kit is provided with prepayment of your DNA test (includes shipping and handling fees).