Although there are some rare exceptions, identical twins are almost always the same sex. Because identical twins occur when a single fertilized egg splits and forms two embryos, each embryo has the ...

Parents and teachers are very concerned with twins and twin relations. While there are some helpful guidelines in dealing with such issues, I would argue that most decisions should be made on a ...

At the core of many people’s fascination with twins is the belief that, at least in the case of identicals, their minds are as similar as are their bodies. There is both truth and conjecture in this ...

I was known for being an identical twin, and that shaped my identity. We lived in a small town in Iowa, and no one could tell us apart. My husband's best friend is a triplet, so he understood that my ...

For the best experience, please enable JavaScript in your browser settings. Following the Kakamega twin puzzle that has drawn the attention of the entire country, we ...

Their children are genetic siblings, known as quaternary twins. After identical twin sisters from Delaware married identical twin brothers from Tennessee, the children they are raising together share ...

It makes sense that identical twins would have the exact same DNA, right? Spoiler alert: Not always! Here's why. Identical twins (also called monozygotic or MZ twins) are conceived when a single sperm ...

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