Dear MEL Topic Readers,
Identical twins aren't always genetically identical, new study finds
Unlike fraternal twins, which result from the fertilization of two separate eggs during the same pregnancy, identical twins are created from a single egg that splits in two. Therefore, identical twins are always of the same sex and had been thought to share all of their genes. However, a new study by a team of Icelandic researchers found that identical twins have genetic differences that begin in the early stages of embryonic development. In about 15% of twin pairs they researched, they found genetic mutations in one of the twins and called it mutation divergence. If that is the case, some of the twin siblings could have a different hair color or certain disease from the other though most of the other features and qualities remain the same.
Be reminded that the chances of having identical twins are rare, only around 3 or 4 in every 1,000 births. Life isn’t as simple as we might think.
Enjoy reading the article and learn more about identical twins.
https://edition.cnn.com/2021/01/08/health/identical-twins-genome-study-scn-scli-intl/index.html
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