Mallory Carlson's baby daughter Josie was diagnosed with a rare form of leukemia. Hours later, doctors discovered that her ...

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 ...

Scientists describe twins as two beings who share the same uterus at the same time. They are further distinguished based on whether they developed from one or many eggs, and whether they shared a ...

My identical twin sons have been fiercely competitive with each other from toddlerhood. Their rivalry helped them thrive on the sports field, but brought tension in academics. Although they now attend ...

A QIMR Berghofer-led international team of scientists has unlocked the genetic secrets behind why some mothers are more likely than others to conceive twins. The study, published in Human Reproduction ...

You've probably heard of identical and fraternal twins, but a report published Thursday says there's a third kind -- sesquizygous twins or "semi-identical." Identical -- or monozygotic -- twins pop up ...

For the best experience, please enable JavaScript in your browser settings. Scientists describe twins as two beings who share the same uterus at the same time. They ...