The following pedigree concerns the autosomal recessive disease phenylketonuria (PKU).The couple marked A and B are contemplating having a baby but are concerned about the baby having PKU.What is the probability of the first child having PKU? Unless you have evidence to the contrary,assume that a person marrying into the pedigree (i.e.,not a descendant of the two parents at the top of the pedigree)is not a carrier.The filled-in individuals have PKU.
A)0
B)1/12
C)1/4
D)3/4
E)9/64

Question

The following pedigree concerns the autosomal recessive disease phenylketonuria (PKU).The couple marked A and B are contemplating having a baby but are concerned about the baby having PKU.What is the probability of the first child having PKU? Unless you have evidence to the contrary,assume that a person marrying into the pedigree (i.e.,not a descendant of the two parents at the top of the pedigree)is not a carrier.The filled-in individuals have PKU. 
A)0 
B)1/12 
C)1/4 
D)3/4 
E)9/64

Quizplus · Accepted Answer

The Answer of The following pedigree concerns the autosomal recessive disease phenylketonuria (PKU).The couple marked A and B are contemplating having a baby but are concerned about the baby having PKU.What is the probability of the first child having PKU? Unless you have evidence to the contrary,assume that a person marrying into the pedigree (i.e.,not a descendant of the two parents at the top of the pedigree)is not a carrier.The filled-in individuals have PKU. 
A)0 
B)1/12 
C)1/4 
D)3/4 
E)9/64

The Following Pedigree Concerns the Autosomal Recessive Disease Phenylketonuria (PKU)