Genetically, identical twins and fraternal twins share the same amount of genes. The enhanced similarities seen in identical twins are a result of environmental factors.

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Identical twins are monozygotic, meaning they come from a single fertilized egg that splits, sharing nearly 100% of their genes. Fraternal twins are dizygotic, coming from two different eggs fertilized by two different sperm, sharing about 50% of their genes, similar to regular siblings. The enhanced similarities in identical twins are largely due to their genetic identity, not environmental factors.

Genetically, Identical Twins and Fraternal Twins Share the Same Amount