It was suspected that two babies had been switched in a hospital. Mr. and Mrs. B
ID: 135438 • Letter: I
Question
It was suspected that two babies had been switched in a hospital. Mr. and Mrs. Brown received baby #1 and Mr. and Mrs. Green received baby #2. Blood typing tests on the parents and the babies showed the following:
Mr. Brown: Type A
Mr. Green: Type AB
Mrs. Brown: Type O
Mrs. Green: Type O
Baby #1: Type A
Baby #2: Type O
What is the probability that Mr. & Mrs. Brown will have a child with Type A blood if Mr. Brown has genotype AA?
What is the probability that Mr. & Mrs. Brown will have a child with Type A blood if Mr. Brown has genotype AO?
What is the probability that Mr. & Mrs. Brown will have a child with Type O blood if Mr. Brown has genotype AO?
What is the probability that Mr. & Mrs. Green will have a child with Type O blood?
Did both families get the right baby? Why?
Mr. Brown: Type A
Mr. Green: Type AB
Mrs. Brown: Type O
Mrs. Green: Type O
Baby #1: Type A
Baby #2: Type O
Explanation / Answer
Mr. Brown: Type A
Mr. Green: Type AB
Mrs. Brown: Type O
Mrs. Green: Type O
Baby #1: Type A
Baby #2: Type O
What is the probability that Mr. & Mrs. Brown will have a child with Type A blood if Mr. Brown has genotype AA?
Answer: 100%
What is the probability that Mr. & Mrs. Brown will have a child with Type A blood if Mr. Brown has genotype AO?
Answer: 50%
What is the probability that Mr. & Mrs. Brown will have a child with Type O blood if Mr. Brown has genotype AO?
Answer: 50%
What is the probability that Mr. & Mrs. Green will have a child with Type O blood?
Did both families get the right baby? Why?
Answer: No, because the Mr. Green and Mrs. Green can never have a baby of type O blood group.
Because Mr. Green is AB blood group. So always pass IA or IB to the baby's so blood type will be A or B.
Mr. Brown: Type A
Mr. Green: Type AB
Mrs. Brown: Type O
Mrs. Green: Type O
Baby #1: Type A
Baby #2: Type O
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