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Risk of a very rare disease

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Hello everyone, could you please help me with the following excercise?

A women is a carrier of a mutation for a very rare disease (for instance, an inborn, recessive glycosylation disorder). Her partner is her second cousin (see family tree). What is the risk that the child has this disease ?

1. 1 in 2.
2. 1 in 4.
3. 1 in 16.
4. 1 in 64.
5. 1 in 256.
Thank you.



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