blood Type and Autism

[Ronald Zeeman]

I have one brother a positive another b positive and the rest of us ab positive. As you would expect with mendel's model. Crazy theories are just that crazy.

 

[Jumpinbare]

Are you saying that to be RH negative you need both parents of Rh- negative blood? Because my dad was O-negative and my mom A-positive. I am A-negative and my brother A-positive. My Ex was A-positive and I A-negative. 3 of my kids are A-Negative and 2 are A-positive. I may be mis-understanding your point?

My father was A+ and my mother is AB+. I am AB-

 

[Cassandra65]

Are you saying that to be RH negative you need both parents of Rh- negative blood? Because my dad was O-negative and my mom A-positive. I am A-negative and my brother A-positive. My Ex was A-positive and I A-negative. 3 of my kids are A-Negative and 2 are A-positive. I may be mis-understanding your point?

The O is recessive, which means you need a copy from each parent to have group O blood. (Humans have 23 matched pairs of chromosomes (other than X&Y), and in most cases, two versions of each gene. 'Dominant' genes can mask 'recessive' versions of the same gene if you have one of each.) In human blood groups, A and B are codominant, and O is recessive. People with group A blood can have A+A or A+O genes, group B can have B+B or B+O, but people with group O must be O+O. (People with A+B are AB blood group.) You can easily have an O child where one or both parents are carrying but not showing the O gene (A+O or B+O), as long as the child inherits an 'O' from each parent.
It's the same inheritance pattern with the Rhesus factor (which is a totally separate set of genes to A B and O) - you can be Rhesus positive with one or two copies of the positive gene, but to be Rhesus negative needs two 'negative' genes.