The chance that any two siblings will be genetically identical is astronomically small.

Question

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Each sibling inherits half of their genetic information from each parent during reproduction, which results in a unique combination of genetic material in each individual. The chance that any two siblings will receive identical combinations of genes from both parents is extremely low. Only identical twins, who develop from the same fertilized egg, have identical genetics.

The Chance That Any Two Siblings Will Be Genetically Identical