Dr. Nancy Segal published an interesting article in the latest edition of Twin Research and Human Genetics titled “Zygosity Diagnosis: When Physicians and DNA Disagree.” A portion of the article is devoted to a mother’s reaction upon discovering via DNA testing that her two-year-old daughters are monozygotic, not dizygotic, as she had previously believed. I am reprinting a paragraph from the article that quotes this mother’s response to this new information. I find what she says perplexing and incomprehensible. Instantly, […]