Even though identical (monozygotic)聽twins may have the exact same genetic make-up, it is possible that they can have different features聽from one another. This is thanks to differences in the womb (also known as 鈥渄evelopmental noise鈥�, where individuals can develop differences due to noise in signalling and signal interpretation) and differences in environments encountered after birth. In fact, the genes 鈥� albeit identical 鈥撀燾an actually be expressed differently, thereby leading to very different drug reactions and susceptibilities to disease. This is one reason why one identical twin may suffer from a disease like Multiple Sclerosis while the other does not.
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