1. Mr and Mrs Smith and Mr and Mrs Doe both had baby girls at Bay...

1. Mr and Mrs Smith and Mr and Mrs Doe both had baby girls at Bay Hospital. The hospital mixed up which girl belonged to which couple. Baby X is blood type O, Baby Y is blood type A. Mr Smith is blood type AB. Mr Doe is blood type B. Both Mrs Smith and Mrs Doe are blood type A. Can you solve which baby goes to which couple? In the form below, list all possible genotypes and indicate the parents for each baby.

Solutions

Expert Solution

Blood typing is determined by the presence of allele I^A, I^B and i allele. Alleles I^A and I^B are codominant and allele i is recessive.

Blood type A contains either I^AI^A or I^Ai genotype. Blood type B contains either I^BI^B or I^Bi genotype. Blood group AB contains I^AI^B genotype. Blood group O contains ii genotype.

Now, Mr. Smith is blood type AB so his genotype is I^AI^B and Mrs Smith is blood type A having either I^AI^A or I^Ai. So they have 2 possibilities of having child with the following blood groups.

I^AI^B X I^AI^A

	I^A	I^A
I^A	I^AI^A	I^AI^A
I^B	I^AI^B	I^AI^B

I^AI^B X I^Ai

	I^A	i
I^A	I^AI^A	I^Ai
I^B	I^AI^B	I^BI

Here no offspring produced is of type O blood group because none of the child has ii genotype.

And Mr Doe is Blood type B which can be genotype I^BI^B or I^Bi and Mrs Doe is blood type A which can be genotype I^AI^A or I^Ai.

So the possible genotypes of offspring will be

	I^A	i
I^B	I^AI^B	I^Bi
i	I^Ai	ii

Here we have obtained a child of blood type O.

Therefore baby X belongs to Mr and Mrs Doe. Baby Y belongs to Mr and Mrs Smith.

gladiator answered 1 year ago

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