Libby Appleby, 37, from West Rainton, County Durham is mother to the first identical twins in the UK who have been born with different skin colours, despite sharing the same genetic make-up.

Whether you’re having fraternal twins or identical twins, it’s good to find out during pregnancy. Get the facts you need about different types of twins.

The Always Identical Twins trope as used in popular culture. Think of your favorite pair of fictional twins. Got them? Now, be honest: Are they identical …

By Mark Ellis. Dr. Neil Whitehead. Eight major studies of identical twins in Australia, the U.S., and Scandinavia during the last two decades all arrive at the same conclusion: gays were not born that way.

What you need to know about identical twins including facts, statistics, misconceptions and myths

Possible Sex Combinations for Identical and Fraternal Twins Answering Questions About Your man and teen Twins

Identical twins start out as genetically identical: they have the same alleles.They are formed by a fertilised egg dividing into two separate individuals. They are always of the same sex, and are monozygotic or MZ twins (mono = one; zygote = fertilised egg).

A letter from a set of identical twin teens alerted me that one, but not the other, would be transitioning to live as a man and asking if they …

Identical twins are exactly alike—or are they? After all, they’re always the same sex, they look exactly alike, they often dress the same (or at least their mothers dress them the same when they’re little), and they tend to …

Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic (“identical”), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic (“fraternal”), meaning that each twin develops from two different eggs and each egg is fertilized by its own sperm cell.