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A 46-year-old member asked:

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

1 doctor answer3 doctors weighed in
Dr. Nikolaos Zacharias
Maternal-Fetal Medicine 27 years experience
Nope!: 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.

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Similar questions

A 36-year-old member asked:

I have partial heterochromia iridis, but my identical twin does not. How is that possible?

1 doctor answer2 doctors weighed in
Dr. Anatoly Belilovsky
Pediatrics 36 years experience
Nevus...: ...Or birthmark - if it happens right over the eye it will involve the iris. A centimeter away, and it's just a birthmark.

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Last updated May 3, 2016
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