four newborn babies in the delivery room of the hospital at thesame time were mi

Question

four newborn babies in the delivery room of the hospital at thesame time were mixed up by the nurse who attached thewristbands. The blood types of the four babes were known tobe AB, O, A and B. how did the doctors find out which babybelongs to which set of parents? Explain how you know qhichbaby belongs to which set of parents, use punnett squares tosupport your reasoning.

parents#1 had blood types O and AB
parents #2 had blood types AB and B
parents #3 had both blood type O
parents #4 had blodd types o and A

Explanation / Answer

Couple #1: Cross between O type (ii) and AB type(IAIB)

i

i

IA

IA i

IA i

IB

IB i

IB i

These parents could have a type A or type Bchild.

Couple #2: Cross between AB type (IAIB) and B type (IBi)

IA

IB

i

IA IB

IB i

IB

IA IB

IB IB

These parents could have a type B (IB I orIB IB) or type AB child.

Couple #3: Cross between O types (ii)

i

i

i

ii

ii

i

ii

ii

These parents could only have a type Ochild.

Couple #4: Cross between O type (ii) and A type(IA i)

i

i

IA

IA i

IA i

i

ii

ii

These parents could have a type A or type Ochild.

The babies’ types are AB, O, A, and B.

Due to our conclusions, the type AB child could only be producedby the cross between the AB and B type parents. The O babywould belong to the cross between the O types, since these parentscannot have a type A or B child. The parents with the crossbetween the O type and A type could only have an A typechild. The cross between the O type and AB type would producethe B type child.

Therefore, your answers are:

Couple #1: AB

Couple #2: B

Couple #3: O

Couple #4: A

i

i

IA

IA i

IA i

IB

IB i

IB i

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