Can a person with o+ and o_ have a a_child?

can two people with o _ and o+ make a_

Expert Answers

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It is not possible for a person with O- and O+ to have a child with A-. 

Remember that each parent gives half of their alleles to their offspring. 

A parent with a blood type of O has OO for their alleles.  In order for a child to inherit the A one of the parents needs to have an A, and if you have at least one A then your blood type will be A. 

Also, the negative is the recessive trait meaning that the positive parent needs to be O-O+ in order to have a chance at passing on the negative trait. 

In this scenario, the parents would need to be A+ or A- and O- or O+ in order to have a child with a blood type of A-. 

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