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10/01/21 10:10 AM IST

Identical twins aren't perfect clones

In news

Scientists in Iceland sequenced DNA from 387 pairs of identical twins — those derived from a single fertilized egg — as well as from their parents, children and spouses

The study
  • A mutation means an alteration in a sequence of DNA — a tiny change that is not inherently good or bad, but can influence physical features or susceptibility to certain diseases.
  • They can occur when a cell divides and makes a slight error in replicating DNA.
  • On average, identical twins have 5.2 of these early genetic differences, the researchers found. But about 15% of identical twin pairs have more genetic differences, some of them up to 100, said Stefansson.
  • These differences represent a tiny portion of each twin’s genetic code, but they could influence why one twin is taller or why one twin is at greater risk for certain cancers.
Source: The Hindu

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