Daurius

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.