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1.

The Secret Life of Twins [electronic resource]: Natural Similarities

How accurate is the term "identical twins"? Can a cell-for-cell likeness between two siblings really exist? And what does that say about the supposed uniqueness of each human being? This program examines the genetics, physiology, and psychology behind such questions as it presents fascinating real-world case studies of identical twin development. Viewers meet monozygotic twins raised apart and finally reunited, another pair who suffered identical illnesses at the same time, and two brothers, both doctors, setting out to discover if their shared genes mean they will be identical forever. Two decades of medical research on physical similarities in twins-recorded down to the tiniest skin markings-highlight the concept of "natural cloning." A
Online
2010; 2009
2.

The Secret Life of Twins [electronic resource]: Nurtured Differences

Despite their shared genetic makeup, some "identical" twins don't appear identical at all-raising important questions about the role of environment in human development. This program explores several ways in which monozygotic twins grow and change on separate paths as well as the epigenetic, anatomical, and psychological factors involved. With the help of 4D scanning and CGI graphics, viewers learn how uterine conditions impact identical twins differently and how life experiences can shape gene expression. Case studies include gay and straight twin brothers, obese and slender twin sisters, and another pair of sisters who seem to have aged at dramatically different speeds. Meanwhile, twin doctors reflect on their contrasts as well as their similarities. A
Online
2010; 2009