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Sometimes different genes are activated in siblings

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Sometimes different genes are activated in siblings

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because of genetic mutation or genetic inheritence

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Different siblings inherit different genes from each of the parents

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Different siblings inherit different genes from each of the parents

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Not all siblings have the same genes.

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different genes from each parent causing different mutations

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because the genes are different and the siblings got different genes from parents

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Are they half or whole siblings?

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its actually timothy

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Sometime siblings don't look the same because they might have different dads.

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why does this happen

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Sometimes siblings may look different but still be siblings because different genes could be expressed while having the same DNA.