Non-twin brothers and sisters share approximately the same number of genes as

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Non-twin brothers and sisters, like dizygotic (fraternal) twins, share approximately 50% of their genes, which is different from monozygotic (identical) twins who share nearly 100% of their genes. The genetic sharing percentage for a grandfather and his grandchild, and an aunt and her nephew, is also around 25%, making them less similar genetically than non-twin siblings or dizygotic twins.

Non-Twin Brothers and Sisters Share Approximately the Same Number of Genes