Identical twins, also known as monozygotic twins because they originate from a single fertilized egg, as noted by Science News, are often studied to determine the origin of specific traits, diseases, or conditions, whether genetic or genetic. from their environment. This study examined in particular 381 pairs of identical twins and found that 38 of the pairs had identical genetics, but that most pairs had some differences in DNA that arose very early in their development.Thirty-nine of the couples had more than 100 changes between the twins, and the study suggests that these DNA differences occur when the embryo divides to form two in early development or shortly after the embryo divides. This suggests that this division of the embryo is not as clean or tidy as previously thought, leading to observed changes in DNA.
Some twins occur when a cell or small group of cells separates from the embryo, Science News notes, and the number of cells from which the twin originates can determine the genetic differences between him and his other twin. The more uneven splitting of the embryo occurs, the greater the number of genetic differences between the twins.
“It’s an extraordinary, exciting, and insightful effort to identify the early cellular mechanisms that explain the genetic differences between MZ (monozygotic) twins,” Nancy Seagal, a psychology professor at NF Seagull, told CNN. “It is well known that MZ duplicates do not show perfect similarity and that some differences may reflect genetic differences. The present study offers new information on the source of the MZ co-twin differences.”Segal said the study showed that “some twin models underestimate the genetic effects and require revision.”
For more twins, check out our list of the best twins in cinema ever, and if you’re looking for more DNA science, read this story about how a new study reveals that most Vikings weren’t blond or blue-eyed.
Wesley LeBlanc is a freelance news writer and creator of IGN guides. You can follow him on Twitter @LeBlancWes.