Is it true that identical twins are genetically identical?



It's a basic premise of human biology that's taught in elementary schools all across the world: Identical twins are genetically identical since they are born from the same fertilised egg. It's true that identical twins have the same DNA code as one another. This is due to the fact that identical twins are made out of the same sperm and egg from their father and mother. (Fraternal twins, on the other hand, are made up of two different sperm and two different eggs.) Normally, the egg and sperm combine to form an embryo, which then develops into a human infant. Identical twins, on the other hand, divide into two embryos early in development. Instead of one baby, two are produced.


According to new research, even if identical twins have highly similar genes, they are not identical. The research sheds new light on why two people who share the same embryo can have such disparities in phenotype, as biologists refer to a person's physical appearance. While the two newborns have the identical DNA code, our genetics are more complicated than that. Our surroundings, exposures, and nutrition influence how our genes are expressed and how our bodies and minds evolve during development in the womb and after birth. For example, two identical twins may have the same height genes, but one twin may be shorter than the other if it does not receive the same quantity of nutrients while in the womb. We also know that throughout the embryonic phase or during development, various modifications to our genes can occur. While this is an uncommon occurrence, it can result in one identical twin having a genetic problem while the other does not. Although our genetic code makes up a big portion of our genetic composition, there are additional genetic and environmental elements that distinguish us!

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