Rhesus Negative Factor

[LizzieW]

Lewis, the rhesus blood groups are more complicated than you think. For instance as we all have equal numbers of genes from our parents, we also have equal numbers of rhesus factors from them. My parents were both rh neg for receiving blood but positive and to give, probably similar to Ayashi on here, however I am Rh A neg, meaning I got 2 rhesus factors from my parents. So I am Rh - -, in the other hand by OH is Rh + - , we know that because all our children are Rh - . I could write pages on this subject but having to type this on my 'phone (laptop out of action) it just takes too long.

[familydar]

Having read military medical records for some of mine I'd put the single offspring (always conceived if not born within a few months of marriage) down to a certain medical condition.  The rhesus factor is something I'd never considered since to the best of my knowledge it's not a problem for current generations.

Jane :-)

[mgeneas]

My mother was O positive I do not know the blood group of my father (long deceased)
I am O negative
My sibling is AB positive
Any ideas what our father's blood group might be?

[Deirdre784]

Sure there are charts online but I can’t find one that i can link to from my phone 🙄

[Nanna52]

Mgeneas, pamela21's reply #49 has a chart that may help you.  Just remember that to have a rhesus negative factor you have inherited negative gene from both parents.  The positive gene is dominant and will dominate the negative (a bit like life, there is often a dominant one in a relationship) so you may be rh+ but have a negative, recessive, gene that can be passed on.
My mother never knew her blood type I was born way before testing for pregnant mums was done, but my father was A+ and I am O- so he must have had a negative and a positive gene.

[macwil]

My mother was O positive I do not know the blood group of my father (long deceased)
I am O negative
My sibling is AB positive
Any ideas what our father's blood group might be?

There is an inhibitor gene which can mask a person's blood type, showing O when tested. The fact that you have a sibling with AB and a mother with O suggests your mother has this inhibitor gene because an O type cannot produce an AB offspring.

[hurworth]

My mother was O positive I do not know the blood group of my father (long deceased)
I am O negative
My sibling is AB positive
Any ideas what our father's blood group might be?

I think you ar mistaken about your mother's blood group.  An O parent can not have an AB child.  People with the AB bloodgroup get the A from one parent and the B from the other parent.

A and B are both dominant phenotypes over O (so if you have AA or AO your blood group is A, and if you have BB or BO your blood group is B).  People with the O bloodgroup must be OO.  She'd have neither an A nor a B, so you mother wouldn't have been able to give your sibling the A or the B.  She could only give them an O.


ETA - I should have read macwill's response!

[mgeneas]

O Positive was on my mother's hospital chart.

Still wondering about my father though! But thanks for all the coments.

As my spouse and I are both O negative does that mean our offspring are too?

[macwil]

O Positive was on my mother's hospital chart.

Still wondering about my father though! But thanks for all the coments.

As my spouse and I are both O negative does that mean our offspring are too?

Yes your mother's chart would show O+ with the normal test if she had the inhibitor.

Yes your children should be O- , unless you, or your husband, also have the inhibitor.

If you are concerned please discuss it with a professional medical expert.