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It is impossible to say with certainty, but the 2 possibilities are type B neg or O neg. The answer depends on whether the father is homozygous or heterozygous for B. In other words, he could have the genes BB or BO, and therefore either contribute just a B, in which case the child would have genotype BO and phenotype B, or the father could contribute a B or and O (if he is genotype BO), and then the child could be either B or O. The child should definitely be Rh-neg.

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14y ago
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14y ago

Possible blood types of children: A+, A-, O+, O-

The 'A' parent either has a genotype of IAIA or IAi and the 'O' parent has a genotype of ii.
more reading:
http://en.wikipedia.org/wiki/ABO_blood_group_system

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11y ago

A combination of a parent with type A negative blood and another with type O positive, the combined positive and negative cells will create type N-D (Neutral-Determination) blood. People with N-D blood cannot donate blood and are at high risk for sexually transmitted diseases such as AIDS and Gonorrhea.

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14y ago

depends on the parents' genotypes (actual genes such as BB, BO, AB, AA, or AO). Since you probably only know the phenotypes (expressed characteristic such as blood type A, B, or AB) we can look at two different scenarios. Parent with B- blood type could be either BO- or BB-. The other with O- has only one possibility of OO-, since it is recessive.

If one parent is BO- and the other is OO- there is

1/4 chance of BO- (B negative)

3/4 chance OO- (O negative)

If one parent is BB- and the other is OO- the child will definitely (100% chance) be BO- , which is B negative

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14y ago

The child may be either O or A blood type depending on the two alleles of the mother. If she is iAi0 then the child may be born with O blood type, if she is iAiA the child will be A blood type.

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13y ago

The children could be either. Blood type is not determined by either parent individually.

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Q: If father O plus and mum A negative what will children be?
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