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?

Answer 1

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%

	IA	IA
IO	IAIO - Group -A	IAIO   - Group -A

What is the probability that Mr. & Mrs. Brown will have a child with Type A blood if Mr. Brown has genotype AO?

Answer: 50%

	IA	IO
IO	IAIO -A blood group	IOIO-O blood group

What is the probability that Mr. & Mrs. Brown will have a child with Type O blood if Mr. Brown has genotype AO?

Answer: 50%

	IA	IO
IO	IAIO -A blood group	IOIO-O blood group

What is the probability that Mr. & Mrs. Green will have a child with Type O blood?

	IA	IB
IO	IAIO -A blood group	IBIO-B blood group.

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 I^A or I^B to the baby's so blood type will be A or B.