Can two o positives make an o negative?

Answer 1

Yes this is true only if both parents are heterozygous positive. This means that the parents genotypes are +- for blood type. + blood type is dominant over - blood type, so this means that one can only have negative blood type if their parents are either heterozygous or homozygous recessive.

A helpful tool to finding out the probability for this question would be to use a punnett square. If you used this method you would find out that two heterozygous positive blood type parents have a 25% chance of producing offspring with negative blood type.

Answer 2

Your baby will come out with a negative blood type that is assuming that negative blood types are dominant and both parents are at least heterozygous negative. Because if they are homozygous negative there would be no chance that the baby will come not come out with a negative blood type.

Answer 3

We are looking for the possible blood types of a baby.

Parental information:

• Mother Rh type positive -- can be (++) or (+-)
• Father Rh type negative -- can only be (--)

Baby receives one gene from each parent:

• Baby is type (+-) = Rh positive
• Baby is type (--) = Rh negative

YES, parents who are Rh pos and neg can have an Rh pos baby. When the Rh factor is positive, it takes a (+) contribution from only one parent to be Rh positive.

Answer 4

No. The + Rh factor is a dominate gene and the - Rh is recessive.