Is it possible for two parents with type o positive blood to have a child with type a negative blood?

Answer 1

Yes, it is.
If someone in paternal and maternal line had Rh-.

What happens is that each child inherits a blood type from his/hers maternal and paternal lines.

To simpify:
If both mother and father inherit (+) from maternal side and (-) from paternal.
Both mother and father are (+) because (+) always dominates (-).
Then, their child could receive: (+)(-) from mother and (+)(-) from father.
Therefore, if child receives (-) from mother and (-) from father, he/she will have Rh(-) blood type.

Also, fyi, two positives do not make a negative.
Rhesus factor is a protein that is contained in a blood flow. If it is there, on both sides of mother and father, it will not disappear. Therefore, if mother and father are both (+)(+), a baby always will be a (+), unless somebody in the family line has a trace of (-).

Also, because (+) always dominates, if mother is (-) and father is (+) without a negative trace, the baby will be (+).

Answer 2

Hmm.......is paternity an issue? No, I don't want to know but answer this yourself. If there is no one else then you might be the recipients of mixed up labs, have them retest. The only other thing I know if is a rare genetic thing called Chimera: In medicine, a person composed of two genetically distinct types of cells. Human chimeras were first discovered with the advent of blood typing when it was found that some people had more than one blood type. Most of them proved to be "blood chimeras" -- non-identical twins who shared a blood supply in the uterus. Those who were not twins are thought to have blood cells from a twin that died early in gestation. Twin embryos often share a blood supply in the placenta, allowing blood stem cells to pass from one and settle in the bone marrow of the other. About 8% of non-identical twin pairs are chimeras. Good luck.

Answer 3

well anything is possible i mean im A- and my husband is B+ and my son is A+ and my daughter is O+ the baby kinda makes their own blood type is what nurses told me and the rh factor comes from the parents you know two positives make a negative and a negative and positve stay positive

Answer 4

I'm pretty sure it's not possible, but I'm not really up on my human growth and development studies

Answer 5

check out this website. I think it explains it really well. Hope this helps. http://www.biology.arizona.edu/human_bio/problem_sets/blood_types/inherited.html

Answer 6

http://www.keepkidshealthy.com/newborn/babys_blood_type.html

hope this will help