Is it possible to have O - blood type and both parents have O +?

Question:

My mother has O+ and she thinks my dad had O+ (he's deceased) but I have O-. Is this possible or is there some other deep dark family secret I need to find out about?

Answers:
Yes, you can't tell anything at all about paternity from blood type.

Other Answers:
cant happen if both parents are positive for the rhesis factor than the child would have to be

It is possible for a blood type to change from + to - or back again as it passes to the next generation.

Yes.
Rh negative children can have parents that are either Rh positive or Rh negative. Each parent could have been herterozygous for the RH factor. You would have inherited the recessive (the negative part) from each one.
If both parents are Rh negative then the children will be Rh negative

I have O-. My father has O+ and my Mom is AB+. There are no deep dark secrets of my parentage. While the norm would be to be positive there are those of us that just have to be different. :)

Both parents are heterozygous for the Rh factor. While they each have two genes for the O blood group (since O is recessive), they have two different genes for the Rh factor. They have one for Rh+ and one for Rh-. Since Rh- is recessive, they are Rh+, but have the ability to have children that are Rh-. You recieved the recessive gene from each parent, causing you to have a different blood type.

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Is it possible to have O - blood type and both parents have O +?

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