How are dizygous twins represented?

Dizygous twins, also known as fraternal twins, are represented by the notation 2z, indicating they originate from two separate eggs fertilized by two different sperm cells. Each twin shares about 50% of their genetic material, similar to regular siblings. In genetic studies, they may be denoted as "DZ" or "fraternal" to distinguish them from monozygotic (identical) twins, who share 100% of their genetic material.