Answer to your Health Question

Question: I would like to know how many genes siblings share. I know that identical twins share 100% of their genes, but i'm curiuos about faternal or regular siblings? Hannah Smith


Answer: Dear Hannah,

Half a child's genes are from his/her mother and half from his/her father. Fraternal twins (like all siblings) share half of their genes. A child has a father and a mother. Consequently, the child and father share 50% of their genes, as do the child and the mother. However, the mother and father normally do not share genes as a result of shared ancestors. Similarly, two full siblings share also on average 50% of the genes with each other, while half sibs share only 25% of the genes.

 

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