Not every set of mirror twins is opposite handed and not every set has different hair whirls.

Misconceptions: For example, one twin will have a birthmark or mole on the right side of the cheek, and the other will the same mole on the left cheek. Past studies of reading ability using similarly aged twin samples showed higher individual differences heritabilities ( h 2 = .63–.84) ( 30 , 31 , 32 ). Mirror twins (also known as mirror image twins) are one of the most fascinating types of twin pairings of the 100 million+ twins all around the world. Maybe you have heard parents say their kids are "mirror twins", or you see twin girls dressed alike and assume that they are identical twins.
Mirror-image twins is an unofficial phenomenon that occurs among identical twins almost 25 percent of the time, according to Dr. Nancy Segal, a psychologist and director of the Twin …

Mirror image twins may have several characteristics that are reversed. Characteristics of Mirror Image Twins. For example, Daniel and I are known as "mirror image twins," which are approximately 25 per cent of all twins. Identical twin Erin Hatfield, a 23-year-old from Augusta, Georgia, has taken to the social networking site Reddit to discuss how the placement of her organs and facial features mirror … Some of these are: Birthmarks and moles – They may appear asymmetrically in mirror twins. These terms sound alike but have some key differences. It's a interesting concept and refers to twins who, when facing each other, appear as matching reflections. The current study investigated the etiology of reading ability and dyslexia in a diverse sample of first grade twins and found substantial estimates of heritability for both reading and dyslexia.

Mirror-image twins are effectively a reflection of one another who share the same DNA but develop asymmetric features, and, like many twins, they speak of sharing an almost psychic connection.
Twins can be described in different ways. That means some of our features are the exact opposite of … some mirror image twins cross their legs opposite to each other; in extreme cases, twins can even have reversed organs; Mirror imaging is never the same for every set of twins – it is a matter of degrees. The Truth About Twins A new book by a prominent twin researcher debunks many popular myths and makes a strong case for how all of us can benefit from studies of identical pairs.