For instance, women who became pregnant soon after the end of the Second World War had a higher-than-average chance of carrying non-identical twins.
One theory is that the most fertile women fell pregnant first as men came home from the war, and these more fertile women were more likely to ovulate twice during one menstrual cycle.
Mark Sanders had just experienced love at first sight at a twins convention in Twinsburg, Ohio, when his first thought was that he better go find his identical twin brother.Marcus Pembrey, emeritus professor of paediatric genetics at University College London, for instance, believes they are next to useless when it comes to telling us anything significant about the role of genes.“In all the years of twin studies I can only think of two occasions when they have produced a meaningful result and I’d be nervous about saying that monozygotic [identical] twins are truly representative of the population. Monozygotic twins are one of nature’s idiosyncrasies.A few days after an egg is fertilised by a sperm the developing embryo splits in two, each sharing the same set of parental genes.But she knew he was the one - and Ginna knew Erich was the one - shortly after their first kisses. And both knew they were paired with the right twin.Dating an identical twin can add a little more complication to an otherwise ordinary relationship, depending on the closeness of the twins and their willingness to play a few pranks on you to make it difficult to tell them apart.