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.