In the ABO blood system, you normally can be type:

1.   ?    A
2.   ?    B
3.   ?    ABO
4.   ?    A, B, AB, O

The universal blood donors for the ABO system are type:

1.   ?    A
2.   ?    B
3.   ?    AB
4.   ?    O

An individual's ABO blood type is normally determined by:

1.   ?    Genetic inheritance and environmental influences during life
2.   ?    Environmental influences alone
3.   ?    The inheritance of 1 of 3 possible alleles (A, B, or O) from each parent

In determining the phenotype for the ABO blood system:

1.   ?    O is dominant over A
2.   ?    B is dominant over A
3.   ?    O is recessive
4.   ?    all of the above

If one of your parents is blood type A and the other is type B, which of the following blood types would you likely be?

1.   ?    A
2.   ?    B
3.   ?    O
4.   ?    AB

A mother of known blood type A has a child whose blood turns out to be B. From this it follows that the mother:

1.   ?    must really have the blood type AB
2.   ?    is heterozygous for the trait
3.   ?    is homozygous dominant for the trait
4.   ?    could have several possible genotypes

A classical example of codominance is

1.   ?    Blood Type O
2.   ?    Blood Type A
3.   ?    Blood Type B
4.   ?    Blood Type AB

Could a man with type O blood and a Women with type AB blood produce a child with type O blood?

1.   ?    Possible
2.   ?    Not possible