A. Parent Genotypes ______ x

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Blood Type Name ______________

Blood type is an example of a single gene that has multiple alleles in humans. One gene codes for proteins on the surface of red blood cells. Each of the three alleles (A, B, or O) is a code for a different protein on the surface of the red blood cells. The

B allele produces b type proteins, the A allele produces a type a type proteins, and the O allele does not produce any proteins.

Your immune system recognizes the proteins on your red blood cells and identifies them as belonging to you. If cells with a different protein enter your body, your immune system will attack them. Alleles A and B are co-dominant. The O allele is recessive. As a result, the following blood types in humans are possible:

Genotypes

Surface Protein Phenotypes

AA or AO

BB or BO

AB

OO

A

B

A and B

None

A

B

AB

O

1. Max has been told that because his blood has no surface proteins he can give blood to anyone.

Therefore he has Type ____ blood and is called a universal _____________.

2. Stephanie has a rare blood type that recognizes all surface proteins. She is type _____ blood and can receive blood from anyone, making her a universal _____________.

1.

A father has type AB blood. A mother is heterozygous for type B blood.

A. Parent Genotypes ___________ x ___________

B.

C. What chance do they have of having a child with type A blood? _________

D. What chance do they have of having a child with type B blood? _________

E. What chance do they have of having a child with type AB blood? _________

F. Is it possible for any of the children to receive blood from their father? _________ Why or why not?

__________________________________________________________________________________

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2.

A father has type O blood. A mother is homozygous for type B blood.

A. Parent Genotypes ___________ x ___________

B.

C. What chance do they have of having a child with type B blood? _____

D. If the father becomes injured and needs a blood transfusion will he be able to receive blood from his wife?

His child? Explain.

__________________________________________________________________________________

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G. If one of their children become injured which parent would they be able to receive blood from? Why?

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3.

A father has type AB blood. A mother has type AB blood.

A.

B

Parent Genotypes ___________ x ___________

C. What is the couple’s chance of having a child with type AB blood? __________

D. What is the couple’s chance of having a child with type A blood? __________

E. Could the mother receive a blood transfusion from all of her children or only some? Explain

__________________________________________________________________________________

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4. A father is heterozygous for type A blood. A mother is heterozygous for type B blood.

A.

B

Parent Genotypes ___________ x ___________

C. What is their chance of producing a child with type O blood? _______

D. What is their chance of producing a child with type B blood? _______

E. Could all of the children safely receive a blood transfusion from their mother? Explain

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5. If Rachel is Type O blood but her mother was type A and her father was type B. Explain how Rachel was able to have her rare type of blood from parents, who both have different blood types than her.

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__________________________________________________________________________.

Rachel can receive blood from ( her Mother / her father / neither / both ). Explain

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Rachel could give blood to ( her Mother / her father / neither / both ). Explain

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6. Timothy’s doctor tells him he has Type B blood. His genotype could be _______ or _______. Timothy has no idea what genotype his parents have. Show 4 possible genotypes his parent could have to give him his Type B blood.

Timothy’s sister has type O blood. Therefore, his parent’s genotype is most likely _____ and _____.

Circle

the Punnett Square above that shows this cross.

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