About every third pair of twins is identical. This happens because the fertilized egg splits in two while it's still a tiny clump of cells.
What happens exactly?
- The self-contained halves then develop into two babies, with exactly the same genetic information.
- Twins conceived from an egg and a sperm are called identical or “identical” (single-celled) twins.
- The biological mechanisms that cause the single fertilized egg cell to split in two remain a mystery.
What do you mean by fertilized egg?
- When an egg is fertilized from the ovary of a woman or female animal, a sperm from the male bonds with the egg, causing a baby or young animal to begin to form.
- A female plant is fertilized when her reproductive parts come in contact with pollen from the male plant.
Learn more about fertilized egg here,
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