A member asked:

I have partial heterochromia iridis, but my identical twin does not. is this a sign that we are fraternal twins?

A doctor has provided 1 answer
Dr. Nikolaos Zacharias answered

Specializes in Maternal-Fetal Medicine

This is a minor somatic difference that does not negate the fact that you two are otherwise identical. You have an expected ~100% identical dna with somatic mutations being the exception that confirms the rule.

Answered May 3, 2016

5.4k views

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