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Blood Types and Alleles

What blood type(s) can a child born to a mother with B- blood type and a father with A+ blood type have? Explain your answer fully. Be sure to focus on the concepts of dominant and recessive alleles, multiple alleles, and codominance in your explanation.

Are there any special concerns this mother should consider?

How do you think O can be the most common blood type when O is recessive?

Describe another trait in humans that shows multiple alleles.

Solution Preview

It's possible, but only if both parents carry the recessive "O" gene and recessive negative Rh factor.

Every person has two genes that will determine their blood type. This is called a genotype. They receive one of those genes from their mother and one of those genes from their father.

Genotype.................Phenotype
AA.............................A blood
AO............................A blood
BB............................B blood
BO............................B blood
AB.............................AB blood (co dominant) ...

Solution Summary

Overview of the results of a Type B- mom with a Type A+ dad, with genetic blood type calculator.

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