Soulmate Gem
Soulmate Gem
Photo: Zeynep Seçer
The term mirror twin is used to describe a type of identical, or monozygotic, twin pairing in which the twins are matched as if they're looking into a mirror — with defining characteristics like birthmarks, dominant hands, or other features on opposite sides.
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Read More »Share on Pinterest Twins are relatively common. In fact, the number of live twin births in 2018 was 32.6 twins per 1,000 births . And while most of us know a pair of fraternal or identical twins — after all, if you grew up in the 80s or 90s, you probably watched a well-known set on “Full House” — fewer know about mirror twins. The phenomena — which occurs in approximately 25 percent of all identical twins, according to Laura Segal, PhD, director of the Twin Studies Center at California State University, Fullerton — is common but relatively unknown. So how do you know if you have (or are a) mirror twin? Here’s everything you need to know about this fascinating condition. What are mirror twins — and how do they differ from identical and/or fraternal twins? The term mirror twin is used to describe a type of identical, or monozygotic, twin pairing in which the twins are matched as if they’re looking into a mirror — with defining characteristics like birthmarks, dominant hands, or other features on opposite sides. Mirror twins always come from a single fertilized egg and share the same genetic makeup. That said, the exact cause of the mirroring in some twin pairs is unclear. Some researchers suggest mirror twins occur when an egg splits later in the fertilization process. Eggs usually split within a week of conception (or less). However, some split later, around 7 to 10 days after — and this may explain the variation. However, researchers have yet to determine why mirroring occurs. Are mirror twins always identical? While all mirror twins are identical, not all identical twins are mirror twins. After all, mirror twins only occur when a single egg splits and that split causes specific traits to develop. According to Leann Poston, MD, a medical content expert at Invigor Medical, “Mirror twins are a type of identical twins which occur when an egg splits later in development and when said egg has already activated the genes that determine the right and left side of the embryo.” While mirror twins often self-identify because they have opposite anatomical features (one has a freckle on the left cheek, while the other has one on the right cheek), they do typically have identical skin, eye, and hair colors. Their size and weight may also be similar. How are mirror twins identified? There is no specific test used to diagnose mirror twins. A DNA test can confirm whether twins are identical, but there are no markers related to mirror twins. Rather, the condition is self-identified. When twins have opposite features from their sibling, they may refer to themselves as mirror twins. Some examples of mirrored features include: birthmarks
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