Thank you #216/#217. I think you explained that a little bit better than me(#162). Rebuttal for #189, read your own link "http://courses.bio.psu.edu/fall2005/biol110/tutorials/tutorial5.htm" Go down to section 11 talking about epistasis. Then think very hard about what could happen genetically with the f2 generation. Its tricky, but its there. Those universities actually agree with me. For those using punnet squares. You are completing the punnet squares correctly, but are failing to realize that punnet squares ignore effects like genetic linkage, and ignores other interactions in molecular pathways. You are correctly applying the general rules of genetics they teach in lower division biology/genetics courses; however, when you get to upper division and graduate level courses you learn about the exceptions to the general rule. Cells in real life are absolutely amazing. #225 also has a good point about human error. The lab might has screwed up your blood test.

Blood type is an epistatic gene. Maybe your type O parent doesn't have the gene to make the proteins needed to express blood type and that's why they're type O. They could have the gene for type B but not the gene to make the protein. The lab could have screwed up your test, too.

or we could go in the different direction and say your mom cheated on your dad and the affair had type B blood

haha, oh well! atleast you have decent parents. i hope.

You can be type B homozygous, meaning you would have either a different mother or father who was type B and passed on the B gene, and the other parent which could have been either of your parents could have passed on the recessive gene. You are probably illegitimate or adopted, but I don't see what's wrong with option 2? How is that a fml?

I never knew being adopted was a bad thing..

Actually, its possible because of the bombay phenotype. If the dad was AiPP (Ai - A bloodtype, heterozygous; PP for attachment of antigen to blood cells) and the mom is Bipp, or BBpp (B bloodtype, pp for bombay phenotype, no attachment of antigen), then the offspring could be BiPp, allowing there to be B bloodtype, because he is inheriting his mother's B blood even though her PHENOTYPE is O. Not likely, but possible

Major Fail #3

HEY JMUR

It actually is possible. I am B+ and both of my parents are a different blood type then me and I am definitely my parents biological child. Here is how this is possible: PARENTS' BLOOD TYPES POSSIBLE CHILD NOT POSSIBLE CHILD